Morning brings HOPE,

Afternoon brings FAITH,

Evening brings LOVE,

Night brings REST,

Hope you will have all of them everyday.

**HAPPY NEW YEAR 2010.**

Maklumat matapelajaran fizik untuk dikongsi bersama

Application of curved mirror.

Watch the video.

Find out more :

1. Why do they use dull black pot instead of white shiny pot ?

2 Where is the pot located ?

3. Are you able to draw ray diagram to show principle focus of the mirror?

Watch the video.

Find out more :

1. Why do they use dull black pot instead of white shiny pot ?

2 Where is the pot located ?

3. Are you able to draw ray diagram to show principle focus of the mirror?

A curved mirror is a section of a sphere.

If the outside surface of the sphere is reflecting, the mirror is convex.

If the inside surface is reflecting, the mirror is concave.

The characteristics of the image formed can be

i. real or virtual

ii. inverted or upright

iii. larger , smaller or the same size of the object

By drawing ray diagrams, you can find out how the image would be.

1. Draw ray from top of object to the curved mirror. After reflecting off mirror, the ray passes through the focal point. (Purple ray)

2. Draw a ray from the top of the object through the focal point. The ray will be parallel to the optical axis after reflecting. (Green ray)

3. Draw the image as a vertical arrow with its tail on the principle axis and the head at the point where the two reflected ray meet.

Tips: Images formed "behind" the concave mirror are always upright and virtual.

1. Draw ray parallel to optical axis. After reflection, this ray travels as if it is coming from the far focus. (Purple ray)

2. Draw line from top of object to centre ,C (Red ray).

3. The virtual image is drawn using a dotted line with an arrow.

Tips: Images formed by a convex mirror are always smaller that object.

Hand on :

Take the standard steel spoon in your kitchen, observe images formed at both side of the spoon at difference distance. What can you say about the image formed?

If the outside surface of the sphere is reflecting, the mirror is convex.

If the inside surface is reflecting, the mirror is concave.

The characteristics of the image formed can be

i. real or virtual

ii. inverted or upright

iii. larger , smaller or the same size of the object

By drawing ray diagrams, you can find out how the image would be.

1. Draw ray from top of object to the curved mirror. After reflecting off mirror, the ray passes through the focal point. (Purple ray)

2. Draw a ray from the top of the object through the focal point. The ray will be parallel to the optical axis after reflecting. (Green ray)

3. Draw the image as a vertical arrow with its tail on the principle axis and the head at the point where the two reflected ray meet.

Tips: Images formed "behind" the concave mirror are always upright and virtual.

1. Draw ray parallel to optical axis. After reflection, this ray travels as if it is coming from the far focus. (Purple ray)

2. Draw line from top of object to centre ,C (Red ray).

3. The virtual image is drawn using a dotted line with an arrow.

Tips: Images formed by a convex mirror are always smaller that object.

Hand on :

Take the standard steel spoon in your kitchen, observe images formed at both side of the spoon at difference distance. What can you say about the image formed?

Labels:
concave,
curved mirror,
ray diagram,
vonvex

Reﬂection occurs when a light ray bounces oﬀ a surface.

Terminology :

Incident ray is the incoming light ray.

Reﬂected ray is the light ray moving away from the surface .

The most important characteristic of these rays is their angles in relation to the reﬂecting surface. These angles are measured with respect to the normal of the surface.

The normal is an imaginary line perpendicular to the surface.

The angle of incidence, θi is measured between the incident ray and the normal.

The angle of reﬂection, θr is measured between the reﬂected ray and the normal.

When a ray of light is reﬂected, the reﬂected ray lies in the same plane as the incident ray and the normal.

Law of Reﬂection

The Law of Reﬂection states that the angles of incidence and reﬂection are always equal and

that the reﬂected ray always lies in the plane of incidence.

When you smile into a mirror, you see your own face smiling back at you. Did you notice that;

i. the size of the image is the same as you (object)

ii. the distance of the image seem as the same distance of you from the mirror.

iii. when you move your left hand, the image will move it right hand

iv. then you image never upside down .

worked example:

Question: An incident ray strikes a smooth reﬂective surface at an angle of 33◦ to the surface normal. Calculate the angle of reﬂection.

Answer

Step 1 : Determine what is given and what is required We are given the angle between the incident ray and the surface normal. This is the angle of incidence. We are required to calculate the angle of reﬂection.

Step 2 : Determine how to approach the problem We can use the Law of Reﬂection, which states that the angle of incidence is equal to the angle of reﬂection.

Step 3 : Calculate the angle of reﬂection We are given the angle of incidence to be 33◦. Therefore, the angle of reﬂection is also 33◦.

quiz :

Terminology :

Incident ray is the incoming light ray.

Reﬂected ray is the light ray moving away from the surface .

The most important characteristic of these rays is their angles in relation to the reﬂecting surface. These angles are measured with respect to the normal of the surface.

The normal is an imaginary line perpendicular to the surface.

The angle of incidence, θi is measured between the incident ray and the normal.

The angle of reﬂection, θr is measured between the reﬂected ray and the normal.

When a ray of light is reﬂected, the reﬂected ray lies in the same plane as the incident ray and the normal.

Law of Reﬂection

The Law of Reﬂection states that the angles of incidence and reﬂection are always equal and

that the reﬂected ray always lies in the plane of incidence.

When you smile into a mirror, you see your own face smiling back at you. Did you notice that;

i. the size of the image is the same as you (object)

ii. the distance of the image seem as the same distance of you from the mirror.

iii. when you move your left hand, the image will move it right hand

iv. then you image never upside down .

worked example:

Question: An incident ray strikes a smooth reﬂective surface at an angle of 33◦ to the surface normal. Calculate the angle of reﬂection.

Answer

Step 1 : Determine what is given and what is required We are given the angle between the incident ray and the surface normal. This is the angle of incidence. We are required to calculate the angle of reﬂection.

Step 2 : Determine how to approach the problem We can use the Law of Reﬂection, which states that the angle of incidence is equal to the angle of reﬂection.

Step 3 : Calculate the angle of reﬂection We are given the angle of incidence to be 33◦. Therefore, the angle of reﬂection is also 33◦.

quiz :

Labels:
form 4,
light,
physics,
reflection

In physics we use the idea of a light ray to indicate the direction that light travels. Light rays are lines with arrows and are used to show the path that light travels.

The most important thing to remember is that we can only see an object when light from the object enters our eyes. The object must be a source of light (for example sun) or else it must reﬂect light from a source (for example the moon), and the reﬂected light enters our eyes.

Light rays are straight lines with arrows to show the path of light.

Light rays are not real. They are merely used to show the path that light travels.

Did you still remember, light travel in straight line?

Formation of shadows is the evidence that light travel in straight line.

~~Test~~ Quiz

1. Are light ray real ? Explain.

2. Give evidence to support the statement:" Light travels in straight lines". Draw a ray diagram to prove this.

The most important thing to remember is that we can only see an object when light from the object enters our eyes. The object must be a source of light (for example sun) or else it must reﬂect light from a source (for example the moon), and the reﬂected light enters our eyes.

Light rays are straight lines with arrows to show the path of light.

Light rays are not real. They are merely used to show the path that light travels.

Did you still remember, light travel in straight line?

Formation of shadows is the evidence that light travel in straight line.

1. Are light ray real ? Explain.

2. Give evidence to support the statement:" Light travels in straight lines". Draw a ray diagram to prove this.

Ripple tank

A*ripple tank* is a shallow glass tank of water used in schools to demonstrate the basic properties of waves. The tank is illuminated from above, so that the light shines through the water.

The ripples on the water show up as shadow on the screen underneath the tank.

All the basic properties of waves can be demonstrated.

A**stroboscope**, also known as a **strobe**, is an instrument used to make a moving object appear to be slow-moving, or stationary.

Source http://commons.wikimedia.org/wiki/File:Simple_ripple_tank.svg

The water acts as a lens to produce a pattern of bright and dark regions on the screen (or a piece of white paper).

A

The ripples on the water show up as shadow on the screen underneath the tank.

All the basic properties of waves can be demonstrated.

A

Source http://commons.wikimedia.org/wiki/File:Simple_ripple_tank.svg

The water acts as a lens to produce a pattern of bright and dark regions on the screen (or a piece of white paper).

Physical quantities are quantities that can be measured. They can be classified into:

(i) Base quantities

A base quantities is a quantity that cannot be expressed in terms of other quantities.

It is very important that you are able to recognise the units correctly. For instance, the new- ton (N) is another name for the kilogram metre per second squared (, while the kilogram metre squared per second squared ( is called the joule (J).

(i) Base quantities

A base quantities is a quantity that cannot be expressed in terms of other quantities.

It is very important that you are able to recognise the units correctly. For instance, the new- ton (N) is another name for the kilogram metre per second squared (, while the kilogram metre squared per second squared ( is called the joule (J).

Lesson review :

- Explain what base quantities and derived quantities are.
- list 5 base quantities and their units
- list 5 derived quantities and their units.

Capacitors are devices used to store electric charge and usually involve conducting plates separated by an insulator. (One plate is positive while the other is negative.)

When the capacitor is connected to a battery, electrons flow from the negative terminal to plate

Capacitors are widely used in electronic circuits to block the flow of direct current (D.C) while allowing alternating current(A.C) to pass, to filter out interference, to smooth the output of power supplies, and for many other purposes.

SPM past year questions:

D__Desktop_r

related video from http://ec.europa.eu/research/mariecurieactions/

When the capacitor is connected to a battery, electrons flow from the negative terminal to plate

Capacitors are widely used in electronic circuits to block the flow of direct current (D.C) while allowing alternating current(A.C) to pass, to filter out interference, to smooth the output of power supplies, and for many other purposes.

SPM past year questions:

D__Desktop_r

related video from http://ec.europa.eu/research/mariecurieactions/

Labels:
capasitor,
form 5,
SPM physics

Normally this is test in paper 2 and 3, remember to answer in full sentence DO NOT write equation !!!

example :

a. ) momentum is product of mass and velocity ( correct )

b. ) momentum = mass x velocity ( wrong)

SPM Physics Terms and Definition

example :

a. ) momentum is product of mass and velocity ( correct )

b. ) momentum = mass x velocity ( wrong)

SPM Physics Terms and Definition

Labels:
Chapter 1.,
Definition,
form 4,
physics

1. Definition of the term in Physics

Force, work, inertia, impulsive force, coherent...

2. The principle in Physics and applications

Force in equilibrium, thermal equilibrium, Pascal's principle, conservation of momentum.

3. The Law in Physics and application

Hooke's Law, Ohm's Law, Boyle's Law, Charles Law

4. Graph skills

Axis, plotting, scale, straight or curve line, gradient, extrapolation.

5. Drawing skills

Total internal reflection, lens ray, inteferens, field circuit, refraction of wave

Mini quizzes :

1. What is meant by frequency of oscillation on spring?

2. What is meant by pressure ?

3. Define speed.

4.

Force, work, inertia, impulsive force, coherent...

2. The principle in Physics and applications

Force in equilibrium, thermal equilibrium, Pascal's principle, conservation of momentum.

3. The Law in Physics and application

Hooke's Law, Ohm's Law, Boyle's Law, Charles Law

4. Graph skills

Axis, plotting, scale, straight or curve line, gradient, extrapolation.

5. Drawing skills

Total internal reflection, lens ray, inteferens, field circuit, refraction of wave

Mini quizzes :

1. What is meant by frequency of oscillation on spring?

2. What is meant by pressure ?

3. Define speed.

4.

SPM at the corner already , it time to refresh some common exam tips. One way

1.

2.

- Cancel or mark (x) which is wrong option then choose.
- Always refer to the formula given on page 2
- Blacken each finished answer immediately.

1.

2.

Labels:
paper 1,
SPM physics,
tips

What to learn in this unit?

1. plot and interpret displacement-time graphs.

2. determine distance, displacement and velocity from a displacement-time graph

3. deduce information from the shape of a displacement-time graph

Content :

On a displacement-time graph, the gradient of the graph is numerically equal to the velocity of the object.

a.On a displacement-time graph, a horizontal line (gradient = ________ ) shows that an object s stationary.

Object moving with constant velocity

Object moving with increasing velocity.

Object moving with decreasing velocity.

1. plot and interpret displacement-time graphs.

2. determine distance, displacement and velocity from a displacement-time graph

3. deduce information from the shape of a displacement-time graph

Content :

On a displacement-time graph, the gradient of the graph is numerically equal to the velocity of the object.

a.On a displacement-time graph, a horizontal line (gradient = ________ ) shows that an object s stationary.

Object moving with constant velocity

Object moving with increasing velocity.

Object moving with decreasing velocity.

The equations of linear motion is apply to bodies moving linearly with uniform acceleration .

There are 5 variables in the equation

*v* = final velocity,

u = initial velocity,

*s* = displacement,

*a* = acceleration,

t = time

You should be able to solve problems using equation about.

Example :

1. A cyclist accelerates uniformly at 1.2 ms-^{2 }in 10 s from rest. What is his displacement at this time?

Tips:

Given;

*u* = 0 ms-^{1}

*a* = 1.2 ms-^{2}

*t* = 10 s

*v* = ? ( since *v is not given you are unable to calculate s using equation 1, 2, 4 and 5)*

* substitute **all given information into equation 3*

s= ut+ 1/2 at^{2}*s*= (0) (10) + 1/2 (1.2) (10)^{2}

=60 m

2. A car approaches a traffic light at 15m/s. The traffic light turns red and the driver applies the brakes at the distance of 25 m from the junction and decelerate at 5 ms-^{2}. Can the car come to complete stop before reaching the stop line at the traffic light? (ans : yes)

Tips:

*learn more in http://en.wikipedia.org/wiki/Equations_of_motion

There are 5 variables in the equation

u

t

You should be able to solve problems using equation about.

Example :

1. A cyclist accelerates uniformly at 1.2 ms-

Tips:

- Rest mean zero velocity !!
- You need to know 3 variables to find out the required quantities .

Given;

s= ut+ 1/2 at

=60 m

2. A car approaches a traffic light at 15m/s. The traffic light turns red and the driver applies the brakes at the distance of 25 m from the junction and decelerate at 5 ms-

Tips:

- remember to insert the negative sign (-) for decelerate

*learn more in http://en.wikipedia.org/wiki/Equations_of_motion

5UM and 5 UKM students pls download.

Fill in the blank i will discuss with you all after 2nd trial.

All the best ...good luck in your coming SPM

tip jawab

Fill in the blank i will discuss with you all after 2nd trial.

All the best ...good luck in your coming SPM

tip jawab

Labels:
check list,
fizik,
physics,
SPM

Dear our form 4 students answer following question before star your lesson.**Pretest: **

1. state the meaning and unit for the symbol

i)

ii)

iii)

iv)

2. Define acceleration and deceleration

Acceleration is the rate of change of velocity. ( 1 mark in paper 2 )

An object ** accelerates** when it moves with

An object ** decelerates **when is getting slower, its

Equation :

where

*a:* acceleration ( ms-^{2})

*u:* initial velocity ( ms-^{1})

*v:* final velocity ( ms-^{1})

*t:* time ( second)

**Calculation:**

**Tips:**

**First of all find out all useful info as highlighted. Then substitute the info given in equation, while you are calculating check whether need to change units or not. (e.g., from km to m, hour to seconds)**

**email your solution to fizikf5@gmail.com**

**1.An athletic runs from the starting line and achieves a velocity of 12 m/s in 3 s. Find his/her acceleration. (ans: 4 ms ^{-2})**

**2. A track travels along a road with a velocity of 20 m/s the driver slam on the brake when a chicken suddenly runs across the road. Assuming the truck take 8s to complete stop from the time the driver hit the brake, determine the acceleration of the lorry. (ans: -2.5 ms ^{-2})**

**3. A motorcycle move with a velocity of 25 m/s. the motorcyclist brakes and its velocity decreases uniformly to 10 m/s in 3s. The motorcycle continues to slow down with the same acceleration until it comes to a stop. Find the time taken for the motorcycle to stop. (ans: 5s)**

* Step 1 : Determine its acceleration in the first 3s,

Step 2 : Determine the time taken .

For more detail study the graph below.

Labels:
Acceleration,
deceleration,
form 4,
physics

1. Perak [paper 1], [paper 2], [ paper 3], [answer]

2. Johor [paper 1], [paper 2], [ paper 3], [answer]

3. Sabah [paper 1], [paper 2], [ paper 3], [answer]

2. Johor [paper 1], [paper 2], [ paper 3], [answer]

3. Sabah [paper 1], [paper 2], [ paper 3], [answer]

Labels:
2009,
percubaan,
SPM,
SPM trials

This is version 09/09/09 by LPM. Hopefully this version will be last until SPM 2009 end.

JadualWaktuSPM0909

JadualWaktuSPM0909

koleksi Sains PMR boleh didapati dari laman web

http://blogsciencepmr.blogspot.com/

disana disediakan soalan-soalan trial 2009 dan tahun-tahun lepas dari semua negeri.

Segala perhormatan diberi kepada guru sain yang mengumpul soalan tersebut dan kesudian beliau berkongsi.

http://blogsciencepmr.blogspot.com/

disana disediakan soalan-soalan trial 2009 dan tahun-tahun lepas dari semua negeri.

Segala perhormatan diberi kepada guru sain yang mengumpul soalan tersebut dan kesudian beliau berkongsi.

1. Bernoulli's principle/ Archimedes principle

2. Basic measurement

3. Wave-reflection of wave

4. Radioactive (E=mc 2)

5. Transistor

6. Logic gate

7. Newton second law

8. Heat ( thermal equilibrium)

9. Electromagnetism

10. Force in equilibrium

12. Generator

2. Basic measurement

3. Wave-reflection of wave

4. Radioactive (E=mc 2)

5. Transistor

6. Logic gate

7. Newton second law

8. Heat ( thermal equilibrium)

9. Electromagnetism

10. Force in equilibrium

12. Generator

To all my student, study before too late. Plan to succeed, don't fail to plan ... good luck in your SPM.

perhatian pelajar 4um dan 4ukm

sila jawab semua soalan dibawah dan hantar melalui e-mail kepada pn chow

sebelum 23 oktober 2009

1. Define distance and displacement

~ Distance between two points is the path traveled by the object.

~ Displacement is distance in a specified direction.

2. Define speed and velocity, and state that v= s/t

~ Speed is the rate of change of distance and can be expressed as:

~Speed = distance / time

~ Velocity is the rate of change of displacement and can be expressed as:

~ Velocity = displacement / time , or

~ v = s/t

3. calculate speed and velocity

a. Which of the following is not a scalar quantity?

Distance / Speed / Velocity

b. What is the speed of cheetah if it sprints 100 m in 4s?

( Tips: check units before do your calculation )

c. The diagrams below shows a ticket tapes .

Determine,

i) Time interval between each dot.

ii) Time taken from A t B.

iii) Distance covered from A to B.

iv) Velocity

sila jawab semua soalan dibawah dan hantar melalui e-mail kepada pn chow

sebelum 23 oktober 2009

1. Define distance and displacement

~ Distance between two points is the path traveled by the object.

~ Displacement is distance in a specified direction.

2. Define speed and velocity, and state that v= s/t

~ Speed is the rate of change of distance and can be expressed as:

~Speed = distance / time

~ Velocity is the rate of change of displacement and can be expressed as:

~ Velocity = displacement / time , or

~ v = s/t

3. calculate speed and velocity

a. Which of the following is not a scalar quantity?

Distance / Speed / Velocity

b. What is the speed of cheetah if it sprints 100 m in 4s?

( Tips: check units before do your calculation )

c. The diagrams below shows a ticket tapes .

Determine,

i) Time interval between each dot.

ii) Time taken from A t B.

iii) Distance covered from A to B.

iv) Velocity

Sharing is caring right? You are free to download my documents.

1. Form 3 science Chapter 4 (reproduction)

2. Form 3 science Chapter 5 (growth)

3. Form 3 science Chapter 6

4. Form 3 science Chapter 7

f3 c7 Electricity

5. Form 3 Science Chapter 8

f3 C8

1. Form 3 science Chapter 4 (reproduction)

2. Form 3 science Chapter 5 (growth)

3. Form 3 science Chapter 6

4. Form 3 science Chapter 7

f3 c7 Electricity

5. Form 3 Science Chapter 8

f3 C8