work and energy

Which of the following best describes work in the context of physics?

• The amount of physical exertion on an object

• The force applied to an object multiplied by the displacement of the object

• The energy stored in an object

• The force applied to an object divided by the displacement of the object

Which of the following is NOT a unit for measuring work?

• Joule (J)

• Newton (N)

• Foot-pound (ft-lb)

• Erg (erg)

According to the principle of conservation of energy, in an isolated system, the total amount of energy:

• Increases over timev

• Decreases over time

• Remains constant

• Is transferred to the surroundings

Which of the following forms of energy is associated with the motion of an object?

• Potential energy

• Kinetic energy

• Thermal energy

• Chemical energy

A ball is lifted to a height of 2 meters. What happens to its potential energy?

• It increases

• It decreases

• It remains the same

• It cannot be determined

The ability to do work or cause a change is known as:

• Power

• Energy

• Force

• Momentum

Which of the following is an example of kinetic energy?

• A compressed spring

• A stone at the top of a hill

• A moving car

• A battery

Which of the following statements is true about the conservation of mechanical energy in a closed system?

• Mechanical energy is always conserved

• Mechanical energy is sometimes conserved, depending on the situation

• Mechanical energy is never conserved

• Mechanical energy cannot be determined in a closed system

Which of the following is an example of work being done?

• Pushing against a wall

• Holding a heavy object without moving it

• Sitting at a desk

• Eating a meal

Which of the following best describes the relationship between work and power?

• Work is the rate at which power is exerted

• Power is the rate at which work is done

• Work and power are the same thing

• There is no relationship between work and power