Energy, Work, and Power

Front

What is energy?

Back

Energy is the ability to do work.

Front

What is work in physics?

Back

Work is done when a force causes an object to move in the direction of the force. It is calculated as Work = Force x Distance.

Front

What is power?

Back

Power is the rate at which work is done or energy is transferred. It is calculated as Power = Work / Time.

Front

How is kinetic energy defined?

Back

Kinetic energy is the energy of an object due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

What is potential energy?

Back

Potential energy is the stored energy of an object due to its position or state, commonly gravitational potential energy, calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is mechanical energy?

Back

Mechanical energy is the sum of potential energy and kinetic energy in a system.

Front

How does lifting an object relate to work?

Back

Lifting an object requires work because a force (gravity) is acting against the upward movement, and work is done when the object is moved against this force.

Front

What factors affect the power output of a person lifting weights?

Back

Power output is affected by the amount of weight lifted, the number of repetitions, and the time taken to complete the lifts.

Front

What is the relationship between work and energy?

Back

Work done on an object results in a change in energy; energy is transferred when work is performed.

Front

What is the formula for calculating gravitational potential energy?

Back

The formula for gravitational potential energy is PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.