Kinetic Energy Review

Front

What is Kinetic Energy?

Back

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

Front

What is the SI unit of Kinetic Energy?

Back

The SI unit of Kinetic Energy is Joules (J).

Front

How does mass affect Kinetic Energy?

Back

Kinetic Energy is directly proportional to the mass of the object. As mass increases, Kinetic Energy increases if velocity remains constant.

Front

How does velocity affect Kinetic Energy?

Back

Kinetic Energy is proportional to the square of the velocity. If velocity doubles, Kinetic Energy increases by a factor of four.

Front

What is the Kinetic Energy of a 1 kg object moving at 1 m/s?

Back

KE = 1/2 * 1 kg * (1 m/s)² = 0.5 Joules.

Front

What is the Kinetic Energy of a 2 kg object moving at 3 m/s?

Back

KE = 1/2 * 2 kg * (3 m/s)² = 9 Joules.

Front

What is the Kinetic Energy of a 5 kg ball rolling at 10 m/s?

Back

KE = 1/2 * 5 kg * (10 m/s)² = 250 Joules.

Front

What would have the greatest Kinetic Energy: a car driving down a hill, a person running down a hill, or a ball rolling down a hill?

Back

A car driving down a hill has the greatest Kinetic Energy due to its larger mass and speed.

Front

If a cheetah with a mass of 47 kg runs at a speed of 31 m/s, what is its Kinetic Energy?

Back

KE = 1/2 * 47 kg * (31 m/s)² = 22,584 Joules.

Front

What is the Kinetic Energy of a 25,000 g object moving at 2.5 m/s?

Back

KE = 1/2 * 25 kg * (2.5 m/s)² = 78.125 Joules.