Unit 5 Test review - Take 2!

How much power is the  tractor that drags a plow with a force of 500 N a distance of 10 meters in 20 seconds?

• 250 Watts
• 250 Joules
• 100,000 Watts
• 100,000 Joules

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Energy of moving particles is

• thermal energy

• chemical energy

• nuclear energy

• solar energy

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The Law of Conservation of Energy says energy can be:

• created from nothing by people

• destroyed by people

• destroyed by stars

• neither created nor destroyed

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chemical energy --> mechanical energy

• Plants use sunlight to make food

• gears turn on a bicycle making noise

• Sunlight can heat things up

• you eat lunch to have energy to walk around

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The unit for energy

• Joules

• watts

• Newtons

• seconds

• meters

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What is the KE of a 40 kg toy bicycle that is moving at 2 m/s?

• 10 J

• 20 J

• 80 J

• 160 J

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A 75 kg skier is standing at the top of a 25 m hill. What would his kinetic energy at the bottom of the hill be?

• 18,375 m/s

• 11.06 m/s

• 240,000 m/s

• 22.1 m/s

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An object has 64 J of kinetic,134 J of potential, then it will have _____ of mechanical energy.

• 8,576 J
• 189 J 
• 70J
• 198 J 

At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

• A
• B
• C
• D

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What is the v in this equation? Choose the one with the CORRECT unit!

• volume (m³)
• velocity (m/s)
• velocity (m/s²)
• volume (v)

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