Physics Work and Power

Power is a measure of how much ______ can be done in a set amount of ______.

• Work, Time

• Work, Energy

• Energy, Force

• Force, Work

Work is a measure of the energy needed to apply a force across a _______.

• time

• distance

• gravity

• object

A light bulb consumes 100 Watts.  If it is left on for 20 seconds, how much work does it do?

• 5 J

• 2,000 J

• 0.2 J

• 100 J

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For there to be work, there must always be distance.

• True

• False

Power does not depend on...

• strength

• work

• time

• any of these

Which situation is work not done?

• lifting a 20 pound box off the floor

• holding a 20 pound box above the floor

• sliding a 20 pound box across the floor

• sliding a 20 pound box up an inclined plane

What type of energy is in this picture?

• Kinetic

• Potential

• Chemical

• Sound

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NGSS.MS-PS3-5

The SI Unit for Energy is

• Joule

• Newton

• Calorie

• Watt

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The roller coaster car has a mass of 500 kg. It is pulled from position 1 to 2 (30 m) by a motor. At the top of the ride the vertical distance top to bottom is 20 m. The motor pulls the car with a 4000 N force. Calculate the work done getting the car to the top of the ride.

• 100 000J

• 120 000J

• 800 000J

• 90 000J

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On another day Bob does 30 000J of work riding up the slope and gaines 28 000J in E_p. If it takes the same amount of time 20 seconds to get to the top calculate the power he uses for both routes.

• 1400J and 1300J

• 1400J and 2000J

• 1400J and 1500J

• 14000J and 15000J

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NGSS.MS-PS3-2

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