Unit 4 Energy

On a force versus change in position graph, the area under the curve is a representation of:

• force

• position

• KE

• PE

• Work

An object that has kinetic energy must be –?–, whereas gravitational (potential) energy is energy of –?–.

• accelerating; motion

• elevated; friction

• falling; gravity

• moving; position

• at rest; work

Tags

NGSS.HS-PS3-2

An acorn falls from a tree. Compare its kinetic energy KE to its gravitational potential energy PE.

• KE increases and PE decreases

• KE decreases and PE decreases

• KE increases and PE increases

• KE decreases and PE increases

• cannot be determined

Tags

NGSS.HS-PS3-1

Describe the energy of a car driving up a hill.

• All KE

• All PE (gravitational)

• Both KE and PE (gravitational)

• all elastic

• all thermal

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

Swimmers at a water park have a choice of two frictionless water slides, as shown. Although both slides drop over the same height, h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then leveling out. How does the speed of a swimmer reaching the end of slide 1 compare with , the speed of a swimmer reaching the end of slide 2?

• v₁ > V₂

• v₁ < V₂

• v₁ = V₂

• There is no simple relationship between v₁ & V₂

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A mass is attached to one end of a string. The other end of the string is attached to a rigid support. The mass is released from rest at point A and swings in a vertical arc to points B, C, and D. Neglect air resistance.

At what point does the mass have the most potential energy (“energy stored gravitationally”)?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-2

A mass is attached to one end of a string. The other end of the string is attached to a rigid support. The mass is released from rest at point A and swings in a vertical arc to points B, C, and D. Neglect air resistance.

At what point does the mass have its highest speed?

• A

• B

• C

• D

Tags

NGSS.HS-PS3-2

Suppose an object is released from rest at point A.

At what point does the object have the most potential energy (“energy stored gravitationally”)?

• A only

• G only

• A and G

• C

• A, C and G

Suppose an object is released from rest at point A.

At what point does the object have the highest speed?

• A only

• G only

• A and G

• C

• A, C and G

A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height?

• The heavy object, because it has greater kinetic energy.

• The light object, because it has smaller kinetic energy.

• The lightweight object, because it weighs less.

• The heavy object, because it weighs more.

• They both slide up the same height.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2