Energy Review

The Law of Conservation of Energy states that...

(SELECT ALL THAT APPLY)

• Energy cannot be created

• Energy cannot be destroyed

• Energy can be transformed from one type to another (ex: from potential to kinetic)

• Energy can be destroyed

The mass of the cart is 25 kg, what is the total mechanical energy of the system at point C?

• 7350 J

• 6125 J

• 1225 J

• 4410 J

If the mass of the cart is 25 kg, what is the velocity of the cart at Point B?

• 24.2 m/s

• 23.6 m/s

• 12.5 m/s

• 31.6 m/s

Annie is sitting at the top of a roller coaster. At the top of the roller coaster, she has a total potential energy of 400 J. What would Annie's new potential energy be if we quadrupled her mass and tripled her height?

• 4800 J

• 1600 J

• 1200 J

• 3650

A cat is moving on a cart with a total kinetic energy KE. What would the kinetic energy be if the velocity of the cart is doubled?

• 2KE

• 1/(2KE)

• 4KE

• 1/(4KE)

At what point on the pendulum is the mass going the fastest?

• A

• B

• C

• D

Pictured above is a roller coaster. The mass of the cart is 15 kg. What is the total mechanical energy at point A?

• 0 J

• 11025 J

• 4580 J

• 6210 J

What is the total mechanical energy at point B, where the height of the cart is 75 m, if the mass of the cart is 15 kg?

• 11025 J

• 0 J

• 4350 J

• 7350

What is the total mechanical energy at point C, where the cart has a height of 36 m, if the mass of the cart is 15 kg?

• 11025 J

• 5292 J

• 5733 J

• 0 J

What is the amount of gravitational potential energy the cart has at point C, if its mass is 15 kg?

• 5292 J

• 5733 J

• 11025 J

• 0 J