Unit 4 - Energy

What is the SI unit for Energy?

• Joules

• Watts

• Newtons

• Meters

What is the SI unit for Work?

• Joules

• Watts

• Newtons

• Meters

If more force is applied, what happens to power?

• Increase

• Decrease

• Stay the same

What is the SI unit for Power?

• Joules

• Watts

• Newtons

• Meters

Calculate the potential energy of a 10 kg mass 2 meters above the ground

• 9.8 J

• 20 J

• 196 J

• 200 J

What type of energy is always conserved?

• Potential

• Kinetic

• Thermal

• Total

Calculate the kinetic energy of a 5 kg bowling ball rolling at 20 m/s

• 100 J

• 1000 J

• 10000 J

• 980 J

Calculate the work done on a 5 kg box that is pushed for 20 m using a force of 150 N.

• 3000 J

• 15000 J

• 100 J

• 30 J

Work is done when

• displacement is zero

• force is perpendicular to displacement

• force is zero

• A force moves an object

If Mr Jones's truck is more powerful than Mr Smith's motorcycle, which statement is correct?

• The truck takes longer to do work

• The truck takes less time to do work

• The motorcycle is better able to do work

• The truck has less work to do