Energy Review

Front

What is the Law of Conservation of Energy?

Back

Energy cannot be created or destroyed.

Answer explanation

The Law of Conservation of Energy states that energy cannot be created or destroyed.

Front

What is the formula for work?

Back

Work = Distance x Force

Answer explanation

The formula for work is Work = Distance x Force. This formula calculates the amount of work done by multiplying the distance and the force applied.

Front

The SI unit for work that is equal to one Newton-meter is __________________.

Back

Joule

Answer explanation

The SI unit for work that is equal to one Newton-meter is Joule. Joule is the correct choice because it represents the amount of work done when a force of one Newton is applied over a distance of one meter.

Front

If you walk for one mile, and later you walk for two miles, how much work did you do in the 2 mile walk compared to the one mile walk?

Back

You did twice as much work because you walked twice as far.

Answer explanation

The work done is directly proportional to the distance covered. Since you walked twice as far, you did twice as much work.

Front

How many Joules of work are done if you carry a 30N rock for 10 meters?

Back

300 Joules

Answer explanation

To calculate the work done, multiply the force (30N) by the distance (10m). The correct choice, 300 Joules, is obtained by multiplying 30N by 10m.

Front

What is the unit for Kinetic Energy?

Back

Joules

Answer explanation

The unit for Kinetic Energy is Joules, which is a measure of energy. It is the correct choice because it is the standard unit used to quantify kinetic energy.

Front

What is the unit for Potential Energy?

Back

Joules

Answer explanation

The unit for Potential Energy is Joules. Joules is the correct choice because it is the standard unit for measuring energy.

Front

A spring in compressed to 55J of elastic potential energy. When released, what will the Kinetic Energy be?

Back

55 Joules exactly.

Answer explanation

When a spring is released, all of its potential energy is converted into kinetic energy. Therefore, the kinetic energy will also be 55 Joules exactly, which is the same as the initial potential energy.

Front

When a person is pulling back on a bow and arrow, what kind of potential energy is being used? And what kind of energy is being used when it is released?

Back

Elastic Potential Energy; Kinetic Energy

Answer explanation

When pulling back on a bow and arrow, elastic potential energy is used. When released, this potential energy is converted into kinetic energy.

Front

If a rollercoaster is at the top of a hill and has 10,000J of gravitational potential energy and a mass of 75kg, at what height is the rollercoaster sitting?

Back

13.61 meters

Answer explanation

The rollercoaster is sitting at a height of 13.61 meters because it has 10,000J of gravitational potential energy and a mass of 75kg.