Energy Unit - Part 1 Review

What does the Law of Conservation of Energy state?

• Energy cannot be created or destroyed but it can be transferred or transformed.

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

• Energy can be destroyed in an open system, but it can't be created.

• Energy is conserved in an isolated system.

Answer explanation

'Conserved' means to keep the same amount. So, since energy can't be created or destroyed, it is always conserved. An isolated system could simply allow it to be saved in the same location because it can't transfer in or out the system.

As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 

• The PE and KE increase together

• The PE decreases while the KE increases 

• The PE and KE decrease together.

• The KE decreases while the PE increases

When something is dropped from a table, what type of energy transfer takes place?

• Kinetic -> Potential

• Gravitational PE-> KE -> Sound and Thermal

• Gravitational PE-> Chemical

• Gravitational PE -> Elastic -> KE

If the Mechanical Energy of an object is 50J and its Potential Energy is 40 J, what is the object's Kinetic Energy?

• 1 J

• 10 J

• 90 J

• Unable to tell

At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

• A
• B
• C
• D

What is one force that ultimately brings the roller coaster to a stop?

• Static

• GPE

• Friction

• Magnetic

How does the Law of Conservation of Energy explain why something that is falling should speed up?

• It gains KE because it gains PE.

• Its KE decreases because no work was done on it.

• Its kinetic energy increases because the potential energy was transformed.

• Its kinetic energy decreases because it was transformed into PE.

At which point(s) on the roller coaster is the kinetic energy at its maximum?

• A
• B
• C
• D

Is energy always conserved?

• Yes

• No

• Only when in an isolated system

_______________ is the ability to do work.

• energy

• force

• work

• matter