Work, Energy and Power

Two equal mass marbles are at the top of a ramp. One marble falls to the ground off the back while the other rolls down the ramp. What is true about the marbles when they reach the ground?

• The marble that rolled down the ramp is moving faster than the marble that fell.

• The marble that fell down the back of the ramp is moving faster than the marble that rolled.

• The marble that rolled down the ramp is not moving when it reaches the ground.

• The two marbles are moving with the same speed.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

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

Kinetic energy is associated with ---.

• speed

• position

• direction

• temperature

Tags

NGSS.MS-PS3-1

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

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

Energy of a rock perched on a cliff is an example of...

• gravitational
• elastic
• chemical
• kinetic

Tags

NGSS.MS-PS3-2

Energy from a compressed spring would be an example of...

• kinetic
• elastic
• gravitational
• chemical

Tags

NGSS.MS-PS3-2

How do you calculate power?

• P = W/t
• P = E/t
• P = w * t
• P = bbq/chicken

What is the formula for Kinetic Energy?

• PE = m*g*h
• KE = 1/2m*v2
• W = F*d
• P = W/t

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5