Unit 6: Energy

Which point on this roller coaster would potential energy be the greatest?

• A

• B

• C

• D

Which point on this roller coaster would kinetic energy be the greatest?

• A

• B

• C

• D

Describe the energy transformation that occurs when a ball is thrown in the air.

• Kinetic energy increases as potential energy increases; once at the top, potential energy decreases as kinetic energy decreases.

• Kinetic energy increases as potential energy decreases; once at the top, potential energy increases as kinetic energy decreases.

• Kinetic energy decreases as potential energy increases; once at the top, potential energy decreases as kinetic energy increases.

• Potential energy and kinetic energy are both at 100%

What energy transformations would take place with a battery powered electrical circuit with a light?

• electrical--> sound --> heat

• chemical --> electrical--> light --> heat

• electrical--> chemical--> nuclear

• chemical --> sound --> heat

Friction always causes some of the energy in a system to transform into...

• mechanical energy

• potential energy

• thermal energy

• kinetic energy

Which of the following would be a good example of chemical energy transforming into electrical and sound energy?

• windmill

• camp fire

• electric car

• battery powered radio

What happens to the total energy in a system?

• it stays the same as energy transformations take place

• it decreases as energy transformations take place

• it increases as energy transformations take place

• energy is created and destroyed

What does the Law of Conservation of Energy state?

• Energy can't be created or destroyed, but it does change form

• Energy can be destroyed with friction

• Energy can be created with inertia

• Energy can't be created, but can be destroyed

When the PE is at 50% on the roller coaster, what will the KE be?

• 100

• 50

• 25

• 75

A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C. Calculate the specific heat capacity of iron.

• 4.18 j/gºC

• 2.17 j/gºC

• 2567 j/gºC

• 0.46 j/gºC