Energy Review

What is the SI unit used to measure energy?

• Newtons (N)

• Kilograms (kg)

• Joules (J)

• Meters (m)

A 670kg ball is pulled up a slope and reaches a total height of 40 m. Calculate the gravitational potential energy it gains.

• 262,640 J

• 26,800 J

• 6,572.7 J

• 2,731.9 J

Check all of the equations that are related to gravitational potential energy.

• $KE\ =\ \frac{1}{2}\cdot m\cdot v^2$

• $GPE\ =\ m\cdot g\cdot h$

• $m\ =\ \frac{2\cdot KE}{v^2}$

• $m\ =\ \frac{GPE}{g\cdot h}$

Determine the kinetic energy of a 504 kg roller coaster car that is moving with a speed of 17.3 m/s.

• 4359.6 J

• 75,421.1 J

• 8,719.2 J

• 2,197,238.4 J

Kinetic energy is the energy an object has due to its...

• mass

• motion

• weight

• position

As the kinetic energy of the molecules in a substance increases, the temperature of the substance __________.

• Increases

• Decreases

The ability to do work (move) is called...

• Matter

• Weight

• Energy

• Force

A box has a mass of 7.2kg. The box is lifted from the garage floor and placed on a shelf. If the box gains 180J of Gravitational Potential Energy (PE), how high is the shelf?

• 2.55 kg

• 2.55 m

• 2.55 N

• 2.55 J

Which has more gravitational potential energy?

• A snowboarder at the top of a mountain

• A person laying on the beach

Which has the most kinetic energy?

• A caught baseball

• A parked car

• A turtle swimming