Mechanical Advantage, Work, and Simple Machines Review

What can a car manufacturer do to increase the mechanical advantage of a steering wheel?

• shorten the axle length of the steering wheel

• . lengthen the axle length of the steering wheel

• decrease the radius of the steering wheel

• increase the radius of the steering wheel

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Which answer lists only simple machines?

• toaster, edger, leaf blower

• pulley, screw, wheel and axel

• screw, ice maker, tires

• cellphone, computers, levers

What is the mechanical advantage of a ramp that is 1 meter tall and 4 meters long?

• 1

• 2

• 3

• 4

A person applies a force of 50 N to push a box across a floor for a distance of 8 meters. How much work does the person do on the box?

• 400 J

• 50 J

• 8 J

• 500 J

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Which is the unit of work?

• Newton

• Joule

• Meter

• Watt

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Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?

• 1
• 10
• 100
• 1000

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What is the ideal mechanical advantage of a lever with a resistance arm of 3 m and an effort arm of 12 m?

• 4
• 0.25
• 15
• 0.5

What kind of lever has the fulcrum between the effort and the resistance and changes the direction of a force?

• 1st Class Lever
• 2nd Class Lever
• 3rd Class Lever
• No Class Lever

if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?

• 120 N
• 5 N
• 2000 N
• 80 N

If 17 Newtons were necessary to move a crate 4 meters, how much work was done? (a)  

• 272 N
• 68 Joules
• 68 N
• 272 J 

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