Energy

What is the potential energy of a rock that has a mass of 10 kg and is sitting on top of a hill 300 m high?

• 3,000 J

• 30,000 J

• 10,000 J

• rock has 0 J of potential energy

Check ALL that are true about the diagram (Assume the person has a mass of 100 kg):

• The initial GPE = 9,800 J

• The initial KE = 0 J

• The final GPE = -9,800 J

• The final GPE = 9,800 J

The kinetic energy of a 14 kg bicycle travelling at 3 m/s is _____ J

An object has kinetic energy if

• if it is above the ground

• it is moving

• if it is at rest

• if it is on the ground

If a ball is rolling up a hill ... (Check ALL that are true)

• it will gain GPE

• it will lose KE

• it will lose GPE

• it will gain KE

The following calculations were made about a roller coaster's energy:

Initial: GPE = 100 J, KE = 300 J

Final: GPE = 400 J, KE = 200 J

Was friction present?

• yes, because there is more final energy compared to initial

• yes, because there is less energy final compared to initial

• no, because no energy was "lost"

• yes, because energy was lost

An object started with 200 J of GPE and ended with 200 J of KE. What happened?

• the object lost KE and gained GPE

• the object lost both GPE and KE

• the object did not move

• the object lost GPE and gained KE

A tennis ball was dropped off the 3rd floor balcony. Identify the energy transfer.

• GPE --> KE because it started at a high height and ended moving

• GPE --> KE because it started at a low height and ended at rest

• KE --> GPE because it started at a high height and ended moving

What part of learning energy do you "like" best so far?

• calculations

• explaining energy transfer

• graphing

• dropping, throwing, swinging, and sliding stuff

Write the symbol/abbreviation for energy turns into heat, sound, etc.