Class 9 Practice Level 2 – Force and Laws of Motion set - 2

Total questions: 25

A 5 kg object is subjected to a net force of 15 N. What is the acceleration of the object?

Topic: Force Calculation

2 m/s²

3 m/s²

4 m/s²

5 m/s²

None

Which of the following scenarios best illustrates Newton's First Law of Motion?

Topic: Newton’s First Law

A car accelerating on a highway

A book remaining at rest on a table

A satellite orbiting the Earth

A ball thrown in the air

None

A truck of mass 2000 kg is moving with a velocity of 15 m/s. What is its momentum?

Topic: Momentum

15,000 kg·m/s

20,000 kg·m/s

25,000 kg·m/s

30,000 kg·m/s

None

When an object moves on a surface, the type of friction it experiences is:

Topic: Friction

Static friction

Sliding friction

Rolling friction

Fluid friction

None

If the force acting on a 6 kg object is increased from 12 N to 24 N, what happens to the acceleration?

Topic: Newton’s Second Law of Motion

It doubles

It halves

It remains the same

It becomes zero

None

An impulse of 50 Ns is applied to a 10 kg object initially at rest. What will be its velocity?

Topic: Impulse and Momentum

2 m/s

5 m/s

10 m/s

20 m/s

None

Which force acts towards the center of the circle in uniform circular motion?

Topic: Circular Motion

Centrifugal force

Centripetal force

Gravitational force

'Frictional Force'

None

When a bird pushes down on the air with its wings, the air pushes the bird up. This is an example of?

Topic: Newton’s Third Law of Motion

Newton's First Law

Newton's Second Law

Newton's Third Law

Law of Conservation of Momentum

None

The gravitational force between two objects is directly proportional to?

Topic: Gravitational Force

The square of the distance between them

The product of their masses

The difference in their velocities

The sum of their volumes

None

10.

Work done by a constant force is zero when the displacement is?

Topic: Work and Energy

Along the direction of force

Opposite to the direction of force

Perpendicular to the direction of force

Parallel to the direction of force

None

11.

Which of Newton’s laws is also known as the law of inertia?

Topic: Newton’s Laws

First Law

Second Law

Third Law

None of the above

None

12.

A 10 N force and a 20 N force act in opposite directions on an object. The net force is:

Topic: Net Force

10 N

20 N

30 N

5 N

None

13.

The acceleration due to gravity on the surface of the Earth is approximately:

Topic: Acceleration due to Gravity

8.9 m/s²

9.8 m/s²

10.8 m/s²

11.8 m/s²

None

14.

Which law explains why it is harder to push a loaded wheelbarrow than an empty one?

Topic: Newton’s Laws

Newton's First Law

Newton's Second Law

Newton's Third Law

Law of Gravitation

None

15.

The tension in a rope is greatest when:

Topic: Tension Force

The rope is slack

The rope is horizontal

The rope is vertical

The rope is at an angle

None

16.

If the velocity of an object changes from 15 m/s to 30 m/s in 3 seconds, what is its acceleration?

Topic: Force and Motion

5 m/s²

10 m/s²

15 m/s²

20 m/s²

None

17.

According to the work-energy theorem, the work done on an object is equal to its change in:

Topic: Work-Energy Theorem

Kinetic energy

Potential energy

Thermal energy

Chemical energy

None

18.

What force is needed to give a 10 kg mass an acceleration of 2 m/s²?

Topic: Force and Mass

5 N

10 N

20 N

25 N

None

19.

Which of the following is an example of Newton’s Third Law?

Topic: Newton’s Third Law

A rocket launching

A car braking

A book on a table

A ball thrown upwards

None

20.

The frictional force is highest when:

Topic: Friction

The surfaces in contact are smooth

The surfaces in contact are rough

The object is in motion

The object is at rest

None

21.

Two forces, 5 N and 12 N, act on an object at right angles. The resultant force is:

Topic: Resultant Force

7 N

12 N

13 N

17 N

None

22.

Work is done when a force:

Topic: Force and Displacement

Acts perpendicular to displacement

Acts parallel to displacement

Does not cause displacement

Changes direction

None

23.

Which of the following quantities is conserved in an isolated system?

Topic: Momentum

Force

Mass

Momentum

Energy

None

24.

Kinetic friction acts between:

Topic: Kinetic Friction

Surfaces at rest

Surfaces in relative motion

Smooth surfaces only

Rough surfaces only

None

25.

What provides the centripetal force for a satellite orbiting the Earth?

Topic: Centripetal Force

Frictional force

Tension force

Gravitational force

Electrostatic force

None

1 out of 25

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Class 9 Practice Level 2 – Force and Laws of Motion set - 2

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