Energy ACP 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 the height of an object above the ground.

Front

How is gravitational potential energy calculated?

Back

Gravitational potential energy (PE) is calculated using the formula: PE = mgh, where m is mass (in kg), g is the acceleration due to gravity (approximately 9.81 m/s²), and h is height (in meters).

Front

If 780 J of work is done to lift an object, what is its potential energy at that height?

Back

The potential energy of the object at that height is 780 J.

Front

What is the relationship between kinetic energy and the speed of an object?

Back

The faster an object moves, the more kinetic energy it has. Kinetic energy (KE) is calculated using the formula: KE = 0.5mv², where m is mass and v is velocity.

Front

What is the total mechanical energy (ME) of an object?

Back

Total mechanical energy (ME) is the sum of an object's potential energy (PE) and kinetic energy (KE): ME = PE + KE.

Front

At what point in a pendulum's swing is kinetic energy greatest?

Back

Kinetic energy is greatest at the lowest point of the swing.

Front

What happens to potential energy as an object falls?

Back

As an object falls, its potential energy decreases while its kinetic energy increases, assuming no energy is lost to friction.

Front

What is the formula for calculating kinetic energy?

Back

The formula for kinetic energy (KE) is KE = 0.5mv², where m is mass and v is velocity.

Front

If a car has a mass of 250 kg and a passenger of 75 kg at a height of 20 m, what is their total gravitational potential energy?

Back

The total gravitational potential energy is 63700 J.

Front

What is the unit of energy in the International System of Units (SI)?

Back

The unit of energy in the SI system is the Joule (J).