Work and Energy

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

Calculate the Kinetic Energy (KE) of a girl whose mass is 50 kg who is moving at 4 m/s.

• 200 J
• 800 J
• 400 J
• 100 J

Tags

NGSS.HS-PS3-1

Sue lowers a stack of books with a mass of 20 kg over a distance of 2 meters.  Calculate work.

• 400 J
• -40 J
• -400 J
• -20 J

A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s.  What is the amount of work in joules needed to accelerate the box?

• 50.0
• 60.0
• 20.0
• 45.0

Tags

NGSS.HS-PS2-1

Belly-Flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 10,000J. What is his kinetic energy when his potential energy reduces to 9.7J?

• 9.81J
• 10,000J
• 9.7J
• 9,990.3J

Tags

NGSS.HS-PS3-1

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

• 70J
• 6.8J
• 23.5J
• 17.5J

As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 

• Both the potential energy and kinetic energy decrease
• The potential energy decreases while the kinetic energy increases 
• The kinetic energy decreases while the potential energy increases 
• Bothe the potential energy and kinetic energy increase 

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A crane carries an 8-m long steel girder weighing 2600 N out 12 m to the end of the crane. The crane did ___ of work.

• 0 J

• 2600 J

• 20800 J

• 31200 J

Tags

NGSS.HS-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

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.HS-PS3-1

NGSS.HS-PS3-2