1. Selina Solutions CONCISE subject class 9-ICSE-Physics
1. Chapter 1 – Measurements and Experimentation
2. Chapter 2 Motion In One Dimension
3. Chapter 3 Laws Of Motion
4. Chapter 4 Pressure In Fluids And Atmospheric Pressure
5. Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
6. Chapter 6 Heat And Energy
7. Chapter 7 Reflection Of Light
8. Chapter 8 Propogation Of Sound Waves
9. Chapter 9 Current Electricity
10. Chapter 10 Magnetism
1. Exercise 3A
2. Exercise 3B
3. Exercise 3C
4. Exercise 3D
5. Exercise 3E
State the usefulness of Newton’s third law of motion.
State Newton’s third law of motion.
State and explain the law of action and reaction, by giving two examples.
Name and state the action and reaction in the following
(a) Firing a bullet from a gun,
(b) Hammering a nail,
(c) A book lying on a table,
(d) A moving rocket,
(e) A person walking on the floor,
(f) A moving train colliding with a stationary train
Explain the motion of a rocket with the help of Newton’s third law
When a shot is fired from a gun, the gun gets recoiled. Explain.
When you step ashore from a stationary boat, it tends to leave the shore. Explain.
When two spring balances joined at their free ends, are pulled apart, both show the same
To move a boat ahead in the water, the boatman has to push the water backwards by his oar.
A person pushing a wall hard is liable to fall back. Give reason.
“The action and reaction both act simultaneously.” Is this statement true?
“The action and reaction are equal in magnitude”. Is this statement true?
A light ball falling on the ground, after striking the ground rises upwards. Explain the reason.
Comment on the statement ‘the sum of action and reaction on a body is zero’.
[Hint: The statement is wrong]
Newton’s third law:
(a) Defines the force
(b) Defines the force quantitatively
(c) Explains the way a force acts on a body
(d) Gives the direction of force.
Action and reaction act on the:
(a) Same body in opposite directions
(b) Different bodies in the opposite direction
(c) Different bodies, but in the same direction
(d) Same body in the same direction.
A boy pushes a wall with a force of 10N towards the east. What force is exerted by the wall on
In the figure, a block of weight 15N is hanging from rigid support by a string. What force is exerted by
(a) Block on the string
(b) String on the block
Name them and show them in the diagram.
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Selina Solutions CONCISE subject class 9-ICSE-Physics
Chapter 1 – Measurements and Experimentation
Chapter 2 Motion In One Dimension
Chapter 3 Laws Of Motion
Chapter 4 Pressure In Fluids And Atmospheric Pressure
Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
Chapter 6 Heat And Energy
Chapter 7 Reflection Of Light
Chapter 8 Propogation Of Sound Waves
Chapter 9 Current Electricity
Chapter 10 Magnetism
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