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1. A particle moves under the influence of a force F = 2x î. Calculate the work done by the force as the particle moves from x = 0 m to x = 5 m

A. 10 J B. 25 J C. 50 J D. 5 J

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2. A block of mass 4 kg is moving with a velocity of 2 m/s. The kinetic energy of the block is

A. 16 J B. 8 J C. 4 J D. 32 J

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3. A block of mass 4 kg is moving with a velocity of 2 m/s. The kinetic energy of the block is

A. 8 J B. 4 J C. 16 J D. 32 J

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4. A moving car applies brakes producing constant deceleration. Its kinetic energy decreases

A. Quadratically B. Exponentially C. Not at all D. Linearly

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5. A car accelerates uniformly from rest. The work done by the engine in covering a distance of 100 m is proportional to

A. Distance squared B. Square root of velocity C. Velocity D. Velocity squared

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6. A bullet of mass 0.1 kg is shot horizontally with a speed of 50 m/s. Calculate the kinetic energy of the bullet

A. 250 J B. 100 J C. 50 J D. 125 J

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7. A person pulls a box on a rough surface with a force of 100 N at an angle of 30°. If the box moves 10 m, calculate the work done

A. 2000 J B. 500 J C. 866 J D. 1000 J

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8. A bullet of mass 10 g is fired with a velocity of 400 m/s. The kinetic energy of the bullet is

A. 80 J B. 160 J C. 1600 J D. 800 J

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9. What is the power of a motor that lifts a 100 kg load vertically by 5 m in 10 seconds

A. 1000 W B. 100 W C. 500 W D. 50 W

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10. The work done by a non-conservative force is

A. Zero B. Path-dependent C. Path-independent D. Infinity

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11. The work-energy theorem states

A. Work done by the net force is equal to the change in kinetic energy B. Work is equal to energy C. Work done is equal to the change in potential energy D. Work done is equal to power multiplied by time

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12. A man does 20 J of work in 4 seconds. His power output is

A. 15 W B. 5 W C. 20 W D. 10 W

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13. A ball of mass 2 kg is dropped from a height of 10 m. The work done by gravity during the fall is

A. 20 J B. 200 J C. 400 J D. 10 J

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14. The power output of a machine that lifts a mass of 50 kg vertically at a constant speed of 5 m/s is

A. 2500 W B. 500 W C. 1000 W D. 1250 W

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15. A particle moves under the influence of a force F = 2x î. Calculate the work done by the force as the particle moves from x = 0 m to x = 5 m

A. 25 J B. 50 J C. 5 J D. 10 J

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16. Which of the following forces is a conservative force

A. Gravitational force B. Air resistance C. Friction D. Normal force

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17. A ball of mass 1 kg is thrown vertically upward with a speed of 10 m/s. The maximum height attained is

A. 5 m B. 10 m C. 2.5 m D. 1 m

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18. A 10 kg block is pushed up a frictionless incline with a force of 100 N. The incline makes an angle of 30° with the horizontal. Calculate the work done by the force in moving the block up by 3 m

A. 500 J B. 300 J C. 900 J D. 600 J

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19. A 10 kg block is pushed up a frictionless incline with a force of 100 N. The incline makes an angle of 30° with the horizontal. Calculate the work done by the force in moving the block up by 3 m

A. 500 J B. 600 J C. 900 J D. 300 J

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20. The mechanical energy of a system is conserved when

A. Only frictional forces act B. None of these C. Only gravitational forces act D. Both frictional and gravitational forces act