Work Power and Energy

If you use 30 J of energy to move an object, you have done ____ J of work.

• 3

• 10

• 30

• 0

Jane carries a 5 kg box and Lorie carries a 10 kg box up a set of stairs, who did more work?

• Jane because his box was lighter.

• Lorie because her box weighed more.

• Can't tell.

Energy is

• how fast you do something.

• the ability to do work.

• confusing.

• how fast you lift something.

Tags

NGSS.MS-PS3-5

How much power is generated by Ashley (50 kg) running up a 6 m flight of stairs in 5 seconds?

• 60 W

• 62 W

• 600 W

• 1500 W

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

Work is done only if

• a force is applied.

• the force applied causes the object's motion.

• an object is in motion.

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

If you lift a box that is twice as heavy as your friend you are doing

• the same amount of work.

• two times more work than your friend.

• half as much work as your friend.

• Cannot be determined.

If you carry a 5 kg box across the room at a constant velocity

• you do no work.

• you do some work.

• you do negative work.

• Cannot be determined.

What is the kinetic energy of a 10 kg ball moving at 3 m/s?

• 15 J

• 30 J

• 45 J

• 90 J

Tags

NGSS.MS-PS3-1

A 5 kg cat falls off a 3 m tall fridge. What is the cat's PE as it starts to fall?

• 15 J

• 30 J

• 150 J

• 1470 J

Tags

NGSS.MS-PS3-2

A 5 kg cat falls off a 3 m tall fridge. What is the cat's KE just before it lands on the floor?

• 15 J

• 30 J

• 150 J

• 1470 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4