Work and energy transfer

Calculate the gravitational potential energy of a 2kg cat-Earth system perched 10 meters above the ground.

• 20 J

• 200 J

• 2.04 J

• 200 W

Tags

NGSS.MS-PS3-2

Calculate the work needed to raise a 3 kg cat up to a height of

4 m.

• 12 J

• 0 J

• 120 J

• 1.22 J

Sue raises a stack of books with a mass of 20 kg over a distance of 2 meters. Calculate the work done on the stack of books.

• 400 N

• 40 J

• 400 J

• 20 J

Belly-Flop Bernie dives from atop a tall flagpole into a swimming pool below. The gravitational potential energy of the Bernie-Earth system when Bernie is at the top is 10,000 J.

What is his kinetic energy when the gravitational potential energy of the Bernie-Earth system reduces to 10 J?

• 9.81J

• 10,000J

• 10J

• 9,990J

What is the work done on a cart when a 20-N force pushes a cart 3.5 m?

• 70J

• 6.8J

• 23.5J

• 17.5J

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

• 0 J

• 39000 J

• 20800 J

• 2600 J

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

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-PS3-5

NGSS.MS-PS3-4

What is the ability to work called?

• electricity
• transfer
• generator
• energy

Tags

NGSS.MS-PS3-5

the transfer of energy that occurs when a force makes an object move in the direction of the force while the force is acting on the object

• energy transfer

• kinetic energy

• energy transformation

• work

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

when one form of energy changes into another form of energy

• energy transfer

• energy motion

• energy transformation

• open system

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

NGSS.MS-PS3-3