Energy Test Review

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 the product of the force and the distance moved in the direction of the force.

Front

In which situation is work not done?

Back

Holding a 20 pound box above the floor is an example where work is not done because there is no movement in the direction of the force.

Front

What is kinetic energy?

Back

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

Front

How does speed affect kinetic energy?

Back

The faster an object moves, the more kinetic energy it has.

Front

What is the formula for calculating kinetic energy?

Back

KE = 1/2 mv², where m is mass and v is velocity.

Front

Calculate the kinetic energy of an 8 kg rock with a speed of 3 m/s.

Back

36 J.

Front

What is mechanical energy?

Back

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

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration, often calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

Calculate the potential energy of a car with a mass of 2,500 kg that is on a hill 100 meters above sea level.

Back

2,450,000 J.

Front

What is the relationship between mass and potential energy?

Back

Potential energy increases with an increase in mass, as it is directly proportional to mass.