Work, Energy, and Power

Suppose a cart has a kinetic energy of 0.5 J. If you add enough mass to double the mass and make the cart go three times as fast, its kinetic energy is now ---.

• 6 J

• 3 J

• 18 J

• 9 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A crane lifts an 8-m long steel girder weighing 2600 N up 15 m off the ground. The crane did ___ of work.

• 0 J

• 39000 J

• 20800 J

• 2600 J

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-2

Potential energy is associated with ---.

• speed

• position

• direction

• temperature

Tags

NGSS.MS-PS3-2

Kinetic energy is associated with ---.

• speed

• position

• direction

• temperature

Tags

NGSS.MS-PS3-1

A block starts at rest at point P at the top of a ramp which is height h above the ground. The block slides down one side and up the other, stopping at a point less than h above the ground.

• The block did not go as high on the other side because gravity pulls down.

• The block did not go as high on the other side because potential energy always has to decrease.

• The block did not go as high on the other side because work from friction made the mechanical energy less.

• The situation as described is impossible to happen.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

If there is no friction on this track, at which point would the coaster have the most kinetic energy?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Where is the roller coaster gaining potential energy?

• A to B

• B to C

• C to D

• The roller coaster is always losing potential energy

Tags

NGSS.MS-PS3-2

A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much work did they do climbing the stairs?

• 400 J

• 1200 J

• 200 J

• 120 J

Tags

NGSS.MS-PS3-2

A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much power did they exert climbing the stairs?

• 400 W

• 1200 W

• 200 W

• 120 W

Tags

NGSS.HS-PS3-2

How high up is a 3200-kg plane if it has 960000 J of potential energy?

• 10 m

• 30 m

• 307200000 m

• 300 m

Tags

NGSS.MS-PS2-4