Class 9 Practice Level 3 - Force and Laws of Motion - Set 1

Total questions: 15

A force of 100 N is applied at an angle of 30° to the horizontal on a 20 kg object. What is the horizontal component of the force?

Topic: Force and Acceleration

50 N

86.6 N

100 N

43.3 N

None

A 50 kg cart is pushed with a force of 200 N at an angle of 45° to the horizontal. What is the acceleration of the cart in the horizontal direction?

Topic: Newton’s Second Law

$ \displaystyle {2\text{ }m/s{}^\text{2}}$

$\displaystyle {2.83\text{ }m/s{}^\text{2}}$

$ \displaystyle {3.16\text{ }m/s{}^\text{2}}$

$ \displaystyle {4\text{ }m/s{}^\text{2}}$

None

A car of mass 1000 kg moving at 20 m/s comes to a stop over a distance of 50 m. What is the average force exerted on the car?

Topic: Work-Energy Theorem

400 N

800 N

2000 N

4000 N

None

A stone of mass 0.5 kg is tied to a string and rotated in a circle of radius 2 m with a speed of 4 m/s. What is the tension in the string?

Topic: Circular Motion

2 N

4 N

8 N

16 N

None

Two ice skaters, each of mass 50 kg, push off from each other. One skater moves at 3 m/s. What is the velocity of the other skater?

Topic: Conservation of Momentum

1 m/s

2 m/s

3 m/s

4 m/s

None

A ball of mass 0.2 kg moving at 5 m/s is brought to rest in 0.1 seconds. What is the average force exerted on the ball?

Topic: Impulse and Momentum

1 N

5 N

10 N

15 N

None

The gravitational force between two masses 5 kg and 10 kg separated by a distance of 2 m is:

Topic: Gravitational Force

$ \displaystyle {6.67\times {{{10}}^{{-11}}}\,N}$

$ \displaystyle {1.67\times {{{10}}^{{-10}}}\,N}$

$\displaystyle {8.34\times {{{10}}^{{-10}}}\,N}$

$\displaystyle {5.0\times {{{10}}^{{-10}}}\,N}$

None

A rocket with a mass of 500 kg is subjected to a force of 10,000 N. What is the rocket's acceleration?

Topic: Newton’s Second Law

10 m/s²

15 m/s²

20 m/s²

25 m/s²

None

A block is pushed up a 30° incline with a force of 200 N parallel to the incline. If the block moves 5 m along the incline, what is the work done by the force?

Topic: Work and Energy

500 J

700 J

800 J

1000 J

None

10.

A 2 kg object moving at 3 m/s collides elastically with a 1 kg object at rest. After the collision, the 2 kg object moves at 1 m/s. What is the velocity of the 1 kg object?

Topic: Conservation of Momentum

1 m/s

2 m/s

4 m/s

6 m/s

None

11.

A 600 kg rocket accelerates upwards at 15 m/s². What is the force exerted by the gases expelled by the rocket?

Topic: Newton’s Third Law

9000 N

6000 N

12000 N

15000 N

None

12.

A car of mass 1000 kg moving at 10 m/s applies brakes and comes to a stop in 5 seconds. What is the frictional force applied by the brakes?

Topic: Friction and Motion

2000 N

1000 N

5000 N

4000 N

None

13.

A spring with a spring constant of 400 N/m is compressed by 0.2 m. What is the potential energy stored in the spring?

Topic: Work-Energy Theorem

2 J

4 J

6 J

8 J

None

14.

A 10 kg box is at rest on a horizontal surface. The coefficient of static friction is 0.5. What is the maximum force that can be applied horizontally before the box starts to move?

Topic: Newton’s Laws

10 N

20 N

30 N

50 N

None

15.

A 0.1 kg tennis ball moving at 30 m/s is struck by a racket, causing it to reverse direction and travel at 20 m/s. If the contact time is 0.01 seconds, what is the average force exerted by the racket?

Topic: Newton’s Laws

500 N

100 N

200 N

300 N

None

1 out of 15

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Class 9 Practice Level 3 - Force and Laws of Motion - Set 1

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