Work Power and Simple Machines

Which of these is the best definition of Power?

• The change in position over a certain time

• The amount of force applied over a certain time

• The change in speed in a certain time

• The amount of work done in a certain time

A truck pulls a trailer behind it with 1500 N of force for 200 m. How much work is done?

• 500 J

• 1700 J

• 150,000 J

• 300,000 J

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Which of these scenarios shows the Most Power?

• A crane does 3000 J of work in 500 seconds

• A bulldozer does 1500 J of work in 30 seconds

• A dump truck does 1000 J of work in 30 seconds

• A tug boat does 1500 J of work in 60 seconds

A sportscar's engine propels it forward by exerting 2500 N of force over a distance of 100 m. If it takes the sportscar 24 seconds to do this, how much power is the sportscar's engine producing?

• 104 W

• 10,416 W

• 34,982 W

• 250,000 W

How is work defined?

• the amount of energy 

• the transfer of force over a distance

• rate of work in a given time

• the change in distance in a given time

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The wind causes this wind turbine to spin, creating electricity. The moving blades are evidence of

• Solar Power

• Work being done

• Potential energy.

• Mechanical advantage.

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What is the formula to calculate work done by a force?

• Work = Force + Distance

• Work = Force - Distance

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Which is the result of using a more powerful motor to run an elevator

• the same amount of work is done in less time

• less work in done in the same amount of time

• the same amount of time is needed to move the same distance

• a longer time is needed to move a shorter distance

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What is the unit of work in the International System of Units (SI)?

• Joule

• Newton

• Watt

• Pascal

In real simple machines, work output is work:

• done on the machine

• done by the machine

• that is 100% efficient

• that is over 100% efficient