Class 9 Practice Level 3 - Force and Laws of Motion - Set 2

Total question: 15

A force of 120 N is applied to a 40 kg object at an angle of 60° to the horizontal. What is the horizontal component of the force?

Topic: Newton’s Second Law

60 N

80 N

100 N

120 N

None

A 2 kg object is moving in a circle of radius 3 m at a speed of 6 m/s. What is the centripetal force acting on the object?

Topic: Circular Motion

12 N

24 N

36 N

48 N

None

A 50 kg box is pushed up a 25° incline with a force of 250 N. If the box moves 10 m along the incline, what is the work done by the force?

Topic: Work and Energy

500 J

1250 J

2500 J

5000 J

None

A 3 kg object moving at 4 m/s collides elastically with a 2 kg object at rest. After the collision, the 3 kg object moves at 1 m/s. What is the velocity of the 2 kg object?

Topic: Conservation of Momentum

2 m/s

3.5 m/s

4.5 m/s

6 m/s

None

The gravitational force between two masses 8 kg and 12 kg separated by a distance of 4 m is:

Topic: Gravitational Force

$ \displaystyle {4.0\times {{{10}}^{{-11}}}\,N}$

$ \displaystyle {6.0\times {{{10}}^{{-11}}}\,N}$

$ \displaystyle {8.0\times {{{10}}^{{-11}}}\,N}$

$ \displaystyle {9.0\times {{{10}}^{{-11}}}\,N}$

None

A 0.5 kg ball moving at 10 m/s is brought to rest in 0.05 seconds. What is the average force exerted on the ball?

Topic: Impulse and Momentum

50 N

100 N

150 N

200 N

None

A 75 kg astronaut pushes off a 1000 kg spaceship, causing the spaceship to move at 0.5 m/s. What is the astronaut's velocity?

Topic: Newton’s Laws

5 m/s

6.67 m/s

7.5 m/s

8.33 m/s

None

A car of mass 1500 kg is moving around a circular track of radius 50 m at a speed of 10 m/s. What is the centripetal acceleration of the car?

Topic: Circular Motion

1 m/s²

2 m/s²

4 m/s²

5 m/s²

None

A 25 kg object is lifted to a height of 10 m. What is the work done against gravity?

Topic: Work-Energy Theorem

1250 J

2500 J

5000 J

7500 J

None

10.

A 0.2 kg baseball moving at 40 m/s is hit by a bat and reverses direction at 30 m/s. If the contact time is 0.02 seconds, what is the average force exerted by the bat?

Topic: Impulse and Momentum

100 N

200 N

500 N

700 N

None

11.

A 500 kg car accelerates at 5 m/s². What is the reaction force acting on the car?

Topic: Newton’s Third Law

2500 N

5000 N

7500 N

10000 N

None

12.

A 1200 kg car moving at 15 m/s applies brakes and comes to a stop in 6 seconds. What is the deceleration of the car?

Topic: Friction and Motion

2.5 m/s²

3.5 m/s²

4.5 m/s²

5.5 m/s²

None

13.

A spring with a spring constant of 300 N/m is compressed by 0.3 m. What is the potential energy stored in the spring?

Topic: Work and Energy

9 J

10 J

11 J

13.5 J

None

14.

A 20 kg object is at rest on a horizontal surface. The coefficient of kinetic friction is 0.4. What is the force of friction acting on the object when it is in motion?

Topic: Newton’s Laws

78.4 N

76 N

82 N

88 N

None

15.

A 0.3 kg soccer ball moving at 25 m/s is stopped by a goalkeeper in 0.1 seconds. What is the average force exerted by the goalkeeper?

Topic: Impulse and Momentum

75 N

150 N

300 N

55 N

None

1 out of 15

Time's up

Class 9 Practice Level 3 - Force and Laws of Motion - Set 2

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