Class 9 Practice Level 3 – Force and Laws of Motion – Set 2 Leave a Comment / By Gulam Hamza / July 8, 2024 Class 9 Practice Level 3 - Force and Laws of Motion - Set 2 Total question: 15 1. 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 2. 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 3. 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 4. 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 5. 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 6. 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 7. 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 8. 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 9. 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
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