ENERGY REVIEW

"Energy can be transformed from one form into another or transformed from one region or another, but energy cannot be created or destroyed."

Which law is this?

• Law of Conservation of Mass

• Newton's Second Law

• Law of Conservation of Energy

• Law of Conservation of Momentum

______and _____ are the only two sources that produce all the energy on Earth. They both use _______energy.

• Sun; Core of Earth; chemical

• Core of Earth; Nuclear power plant; Solar

• Core of the Earth; sun; kinetic energy

• Sun; Core of Earth; Nuclear

Power is ___________

• is the rate of energy transfer.

• how fast work done.

• all other statements are correct

• is the rate that work is done.

A pendulum is given potential energy by being pulled up to location W. At which location does the pendulum have maximum kinetic energy?

• Location W

• Location X

• Location Y

• Location Z

Where is kinetic energy at its maximum?

• a

• b

• c

• d

If an engineer designs the first hill of a coaster so that it is taller, then

• there will be more potential energy at the top of the first hill.

• there will be more kinetic energy at the bottom of the first hill.

• there will be a greater velocity at the bottom of the first hill.

• it will take more work to get it to the top of the first hill

• all the other statements are correct.

You move a 10-newton weight two meters in 4 seconds. Which shows the correct calculation of how much work you have done on the weight?

You do 90 joules of work in 30 seconds. How much power have you generated?

Joe moves an 8-N weight 5 meters in 2 seconds. Moe moves an 8-N weight 5 m in 4 seconds. Who did the most work on the weight?

• Both statements indicating same work are correct.

• They did the same work; Joe used more power.

• They did the same work, but Joe did the work faster.

• Neither statement indicating same work is correct since Joe did more work.

• 50,000 Joules

• 500,000 Watts