Class 9 Practice Level 2 - Force and Laws of Motion - Set 1

Total questions: 25

A 10 kg object is subjected to a net force of 50 N. What is the acceleration of the object?

Topic: Force Calculation

5 m/s²

10 m/s²

50 m/s²

100 m/s²

None

A car of mass 1000 kg is moving with a velocity of 20 m/s. What is its momentum?

Topic: Momentum

$ \displaystyle {20,000\text{ }kg\cdot m/s}$

$ \displaystyle {10,000\text{ }kg\cdot m/s}$

$ \displaystyle {5,000\text{ }kg\cdot m/s}$

$ \displaystyle {40,000\text{ }kg\cdot m/s}$

None

If the mass of an object is doubled while the net force on it remains constant, what happens to the acceleration?

Topic: Newton’s Second Law

It doubles

It halves

It remains the same

It becomes zero

None

Which type of friction occurs when a box is sliding on a rough surface?

Topic: Friction

Static friction

Sliding friction

Rolling friction

Fluid friction

None

When a bullet is fired from a gun, the gun recoils. This is an example of:

Topic: Newton’s Third Law

Newton's First Law

Newton's Second Law

Newton's Third Law

Law of Conservation of Energy

None

What is the impulse experienced by a 5 kg object subjected to a force of 10 N for 2 seconds?

Topic: Impulse and Momentum

5 Ns

10 Ns

20 Ns

40 Ns

None

What provides the centripetal force for a car taking a turn on a flat road?

Topic: Circular Motion

Gravitational force

Frictional force

Normal force

Applied force

None

An object will not change its state of motion unless acted upon by:

Topic: Newton's First Law of Motion

Balanced forces

Unbalanced forces

Equal forces

Net force is zero

None

In an elastic collision, which of the following is conserved?

Topic: Momentum and Collision

Momentum only

Kinetic energy only

Both momentum and kinetic energy

Neither momentum nor kinetic energy

None

10.

If the distance between two objects is halved, the gravitational force between them:

Topic: Gravitational Force

Doubles

Halves

Quadruples

Remains the same

None

11.

Two forces, 20 N and 30 N, act on an object in opposite directions. The net force on the object is:

Topic: Net Force

10 N

50 N

20 N

30 N

None

12.

What is the acceleration due to gravity of an object in free fall near the Earth's surface?

Topic: Free Fall

9.8 m/s²

10 m/s²

1 m/s²

9.8 km/s²

None

13.

According to Newton’s Third Law, the reaction force to a hammer striking a nail is:

Topic: Action and Reaction Forces

The nail pushing back on the hammer

The hammer pushing forward

The nail moving

None of the above

None

14.

In a tug of war, the rope exerts which type of force on the participants?

Topic: Tension Force

Gravitational force

Frictional force

Tension force

Normal force

None

15.

Which of Newton’s laws explains the motion of a rocket?

Topic: Newton’s Laws

First Law

Second Law

Third Law

None of the above

None

16.

If a force of 100 N is applied to a 25 kg object, what is the acceleration?

Topic: Force and Acceleration

2 m/s²

4 m/s²

8 m/s²

10 m/s²

None

17.

Work done by a force is equal to the force multiplied by

Topic: Work and Energy

Distance

Time

Velocity

Acceleration

None

18.

What effect does increasing the roughness of a surface have on friction?

Topic: Friction and Motion

Decreases friction

Increases friction

Has no effect on friction

Changes the direction of friction

None

19.

Which of the following forces provides the centripetal force necessary for a satellite to orbit Earth?

Topic: Centripetal Force

Gravitational force

Magnetic force

Frictional force

Electrostatic force

None

20.

The mass of an object on the moon compared to its mass on Earth is:

Topic: Mass and Weight

Less

The same

Double

None

21.

Two forces of 10 N and 20 N act on an object at right angles. The resultant force is:

Topic: Resultant Force

10 N

20 N

22.4 N

30 N

None

22.

If the velocity of an object changes from 10 m/s to 20 m/s in 2 seconds, what is its acceleration?

Topic: Force and Motion

5 m/s²

10 m/s²

15 m/s²

20 m/s²

None

23.

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

24.

An ice skater pushes against the ice, and the ice pushes back with equal force. This demonstrates:

Topic: Newton’s Laws

Newton's First Law

Newton's Second Law

Newton's Third Law

Law of Inertia

None

25.

Which method is commonly used to reduce friction between moving parts in machines?

Topic: Friction Reduction

Increasing roughness

Applying lubricants

Adding more weight

Using larger surfaces

None

1 out of 25

Time's up

Class 9 Practice Level 2 - Force and Laws of Motion - Set 1

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