Unit 3- Work, Energy, and Power Review

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration. It is often associated with gravitational energy, where an object at a height has potential energy relative to the ground.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object in motion. It is calculated using the formula KE = 1/2 mv², where m is the mass and v is the velocity of the object.

Front

What is mechanical energy?

Back

Mechanical energy is the sum of potential energy and kinetic energy in a system. It represents the total energy available for doing work.

Front

How is gravitational potential energy (GPE) calculated?

Back

Gravitational potential energy is calculated using the formula GPE = mgh, where m is mass, g is the acceleration due to gravity, and h is the height above a reference point.

Front

What is the formula for power?

Back

Power is defined as the rate at which work is done or energy is transferred. The formula is Power = Work / Time.

Front

What happens to mechanical energy in a closed system?

Back

In a closed system, the total mechanical energy remains constant, as energy can neither be created nor destroyed, only transformed from one form to another.

Front

At which position is the roller coaster car's mechanical energy 100% potential energy?

Back

Position A, where the car is at the highest point.

Front

At which position is the roller coaster car's mechanical energy 100% kinetic energy?

Back

Position C, where the car is at the lowest point and moving fastest.

Front

If a 5 kg box is 32 m above the surface of Jupiter, what is its GPE?

Back

The GPE is 3,966.4 J, calculated using GPE = mgh with g = 24.79 m/s².

Front

Who used more power: lifting a 100 kg weight in 5 seconds or in 8 seconds?

Back

The person lifting in 5 seconds used more power.