ICSE Worksheet for chapter-6 Newton’s Laws Of Motion class 9

ICSE Worksheet for chapter-6 Newton’s Laws Of Motion class 9

Worksheet For class 9

Find ICSE Worksheet for chapter-6 Newton’s Laws Of Motion class 9

CLASS-9

BOARD: ICSE

Physics Worksheet - 6

TOPIC: Newton’s Laws Of Motion

For other ICSE Worksheet for class 9 Science check out main page of Physics Wallah.

SUMMARY

• Mass and Inertia, Types of Inertia, Newton’s first law of motion

• Linear momentum, Rate of change of momentum, Newton’s second law of motion

• Impulse, Newton’s third law of motion, Mass and Weight, Newton’s Law of Gravitation

SECTION 1 – OBJECTIVE

1. If a body is not accelerated:

(A) Unbalanced force acts on it

(B) Forces acting are not balanced

(C) The resultant force is zero

(D) A single force acts on it

2. For moving a body from rest or stopping a moving body, we need

(A) Force

(B) Mass

(C) Direction

(D) Time

3. If A and B are two objects with masses 10 kg and 30 kg respectively then:

(A) A has more inertia than B

(B) B has more inertia than A

(C)A and B have the same inertia

(D) none of the two have inertia

4. When a bus suddenly starts, the standing passengers lean backwards in the bus. This is an example of:

(A) Newton’s first law

(B) Newton’s second law

(C) Newton’s third law

(D) none of these

5. A man sitting in a train in motion is facing the engine. He tosses a coin up, the coin falls behind him. The train is moving:

(A) Forward with uniform speed

(B) Backward with uniform speed

(C) Forward with acceleration

(D) Forward with retardation

6. China and glass wares are packed with soft material when transported. This is done to:

(A) Increase impulse

(B) Reduce Impulsive force

(C) For cost cutting

(D) None of these

7. A man could swim in river because of:

(A) Newton’s first law

(B) Newton’s second law of motion

(C) Newton’s third law of motion

(D) none of the above

8. A book of weight 10 N is placed on a table. The force exerted by the surface of the table on the book will be:

(A) Zero

(B) 10 N

(C) 20 N

(D) None of these

9. A ball of mass 500g is moving with speed of 36km/hr. It is reflected back with the same speed. What is the impulse applied on it.

(A) 5kgm/s

(B) 10kgm/s

(C) 20kgm/s

(D) 40kgm/s

10. For how much time should a force of 500 N act on a body of mass 10 kg so that it acquires a velocity of 50 m/s.

(A) 5s

(B) 10s

(C) 2s

(D) 1s

SECTION II - SUBJECTIVE

1. Define the following:

(a) Inertia

(b) Force

(c) Gravitational constant (G)

2. Enunciate the Newton’s laws of motion.

3. State Newton’s law of gravitation.

4. The force of attraction between two bodies at a certain separation is 10N. What would be the force of attraction between them, if the separation between them is reduced to half?

5. A man weighs 600N on the earth. What would be his approximate weight on the moon? What is the reason for your answer.

6. A car is moving with a uniform velocity 30m/s. It is stopped in 2s by applying a force of 1500N through its brakes. Calculate:

(a) The change in momentum of car,

(b) The retardation produced in car, and

(c) The mass of car

7. Explain each of the following:

(a) The rider falls backward if the horse suddenly starts running

(b) People often shake branches of a tree for getting down the fruits

(c) A person pushing a wall hard is liable to fall back

8. Distinguish between Mass and Weight.

Answer Key

Objective Problems:

Subjective Problems:

4. Force of attraction is 40N

5. Weight on the moon = 100N

6. (a) Change in momentum = 3000kgm/s

(b) Retardation = 15m/s ²

(c) Mass of car = 100kg