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- 1. Multiple Choice
_______ is defined as the rate at which work is done.
Efficiency
Power
Work
Kinetic Energy
- 2. Multiple Choice
A boy pushes on a parked car with a force of 250N. The car does not move. How much work does the boy do?
250J
250N
0J
2500J
- 3. Multiple Choice
A man pushes a crate along a factory floor by exerting a force of 55N. If the crate moves a distance of 4m, how much work does the man perform?
550J
2200J
220N
220J
- 4. Multiple Choice
A weightlifter presses a 400N weight 0.6m over his head in 2s. What is the power of the weightlifter?
120W
1200W
200W
240W
- 5. Multiple Choice
In which of the situations is NO work being done?
pushing a box across the floor
lifting a box from the ground to a table top
holding a box overhead
carrying a box up a flight of stairs
- 6. Multiple Choice
As a dropped coin falls toward the ground, ____ energy is converted to ____ energy.
heat, kinetic
potential, heat
kinetic, potential
potential, kinetic
- 7. Multiple Choice
The law of conservation of energy states that energy
can only be converted into heat
cannot be created or destroyed
is created from motion.
is always opposite.
- 8. Multiple Choice
A worker carrying a box of mass 20 kg to a height of 2.5m. Calculate the work done by the worker in carrying the box.
49.05J
490.5J
4950J
1000J
- 9. Multiple Choice
A boy of mass 51kg climbed up a staircase of height 4m in 5s. Calculate the power delivered by the boy
255W
204W
2001.24W
400.25W
- 10. Multiple Choice
A motor rated 100W has been operating for 150s. If the efficiency of the motor is 75%, how much work is done by the motor?
1125000J
1125J
11250J
24000J
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