Work Energy

You use 750 J of energy to push a sofa. If it took you 6 sec to move the sofa, what was your power?

• 125 W

• 4750 J

• 4750 W

• 190 W

A girl on a motorbike passes by at a speed of 15 m/s. Her mass is 40 kg. What is her kinetic energy? 

• 300 Joules

• 600 Joules

• 950 Joules

• 4500 Joules

Tags

NGSS.MS-PS3-1

Calculate the potential energy of a roller coaster at the top of a 72 m hill that has a mass of 112 kg.

• 80640 J

• 790,720 J

• 8,640 J

• 790,700 J

Tags

NGSS.MS-PS3-2

Which character has the greatest gravitational potential energy?

• Character A

• Character B

• Character C

• Character D

Tags

NGSS.MS-PS2-4

Which skier has the greatest kinetic energy?

• Skier A

• Skier B

• Skier C

• Skier D

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Pratik can carry 300N load and walks a distance of 100m in 50 seconds. What is the power of Pratik?

• 600 W

• 1000000 W

• 400 W

• 25 W

Tags

NGSS.MS-PS3-5

Pat spent 200 seconds pushing on this wall and exerted 150 N. How much work did they do?

• 1.33 W

• 30,000 W

• 30,000 J

• 0 J

Tags

NGSS.MS-PS2-1

A typical internal combustion engine only converts 20-40% of the potential energy stored in fuel to the mechanical movement of the car. Where does a majority of the energy go?

• Light Kinetic

• Heat Kinetic

• Elastic Potential

• Gravitational Potential

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-3

NGSS.MS-PS3-4

According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 

• destroyed, destroyed

• created, saved

• created, destroyed

• lost, found

Tags

NGSS.HS-PS3-3

NGSS.HS-PS3-4

Read the picture, then fill in the blank: The ability to work or cause change is _

Tags

NGSS.MS-PS3-5