Work and Energy Review

An energy bar chart is posted above. Which of the following scenarios could represent the cart?

• A car driving up at hill at constant velocity

• A skydiver falling to the ground at constant velocity after opening their parachute

• A ball rolling down a ramp

• A car applying their brakes on a level surface and coming to a stop

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A person holds a yo-yo above the ground before letting go. What type of energy is present before the person lets go?

• Gravitational Potential Energy

• Elastic Potential Energy

• Kinetic Energy

• Thermal Energy

Tags

NGSS.MS-PS3-2

A box slides at a constant velocity across a frictionless floor. What type of energy is present?

• Gravitational Potential Energy

• Elastic Potential Energy

• Kinetic Energy

• Thermal Energy

Tags

NGSS.MS-PS3-1

An object is traveling at a set speed. How will the Kinetic Energy change if that speed is doubled?

• It will double

• It will quadruple

• It will change by a factor of 1/2

• It will change by a factor of 1/4

Tags

NGSS.MS-PS3-1

A man pushes a boulder and the boulder does not move. Which statement correctly describes the scenario

• work is being done by a single object

• All work done is external to the system

• by pushing on the rock, the man causes a transfer of energy

• no work is being done on the object

Tags

NGSS.MS-PS2-2

Which two measurements must be parallel for work to be done

• force and displacement

• distance and direction

• constant force and power

• power and work

A man carries a box across a room at constant velocity. Is work being done on the box by the man?

• Yes

• No

• Half of the time

• Not enough information

Tags

NGSS.MS-PS3-5

A man lifts a box into the air. Is work being done by gravity when the box is lifted into the air?

• Yes

• No

• Half of the time

• Not enough information

Tags

NGSS.MS-PS2-2

A box slides to a stop across a floor. Describe how the Mechanical Energy changes for the box-Earth system.

• It increases

• It decreases

• It remains constant

• The box explodes

Tags

NGSS.MS-PS3-5

A man lifts a weight above his head at constant velocity. Describe the mechanical energy of the weight-earth system.

• Mechanical Energy Increases

• Mechanical Energy Decreases

• Mechanical Energy stays the same

• Mechanical Energy is a figment of the imagination

Tags

NGSS.MS-PS3-2