Energy Calculations

Front

What does conservation of energy mean?

Back

Total energy stays the same.

Front

What kind of energy does a marble at the top of a hill have?

Back

Gravitational potential energy.

Front

How much energy leaves the system as heat and sound when an 86 kg boulder falls from a 90 m cliff?

Back

77,400 J.

Front

If you do 40 joules of work lifting a 10N box, how high is the shelf you moved it to?

Back

4m.

Front

If the original amount of mechanical energy in a system was 100 J and the final amount was 50 J, how much work was done to the system?

Back

-50 J of work.

Front

What is kinetic energy?

Back

The energy of an object due to its motion.

Front

What is gravitational potential energy?

Back

The energy an object possesses because of its position in a gravitational field.

Front

What is the formula for calculating gravitational potential energy?

Back

PE = mgh (where PE is potential energy, m is mass, g is acceleration due to gravity, and h is height).

Front

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

Back

Joule (J).

Front

What is the work-energy principle?

Back

The work done on an object is equal to the change in its kinetic energy.