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The work done to move an object is always equal to:
A. The force applied multiplied by the distance
B. The change in potential energy
C. The change in kinetic energy
D. The energy used by the object
Answer: The force applied multiplied by the distance
If the power of a machine is 100 W and it operates for 20 seconds, how much work is done?
A. 2000 J
B. 500 J
C. 1000 J
D. 200 J
Answer: 2000 J
The energy stored in an object due to its position is known as:
A. Kinetic energy
B. Potential energy
C. Thermal energy
D. Chemical energy
Answer: Potential energy
What is the relationship between work, energy, and power?
A. Work is the product of power and time.
B. Energy is the product of work and time.
C. Power is the rate at which work is done.
D. Energy is the rate at which power is used.
Answer: Power is the rate at which work is done.
What is the mechanical advantage of a machine if the input force is 200 N and the output force is 800 N?
A. 4
B. 0.5
C. 2
D. 1.5
Answer: 4
In which situation is no work done?
A. A car accelerating on a flat road
B. A book resting on a table
C. A person lifting a box
D. A ball rolling down a hill
Answer: A book resting on a table
The work done by a force is equal to the:
A. Change in kinetic energy
B. Change in potential energy
C. Force times velocity
D. Force times displacement
Answer: Force times displacement
Which of the following does not affect the power of an engine?
A. The force exerted
B. The time taken
C. The velocity of the object
D. The distance traveled
Answer: The distance traveled
If an object of mass 2 kg is lifted to a height of 10 meters, what is the work done against gravity? (Take g = 9.8 m/s²)
A. 196 J
B. 20 J
C. 9.8 J
D. 98 J
Answer: 196 J