Work and Simple Machines Quiz

Of the following situations, the one in which work is NOT done is:

• Lifting a backpack

• Carrying a backpack

• Hitting a baseball

• Pulling a sled

Which type of simple machine is present in the picture below

• Inclined Plane

• Lever

• Screw

• Wheel and axle

When a machine changes the size of a force, the ____ must also change.

• mass

• work

• direction

• distance

To do the same amount of work on an object, a large force applied over a short distance can be exchanged by

All simple machines

• Make work easier.

• Increase the force required to do work.

• Decrease the amount of work done.

• Make work harder.

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This is an example of a

• Pulley

• Wheel and Axle

• Inclined Plane

• Wedge

You have a pulley system that requires 500 N of force to lift a 1,700 N engine block. What is the mechanical advantage of the pulley system?

• 0.29

• 3.4

• 29%

• 1,200 N

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The mechanical advantage of a machine is the number of times a machine increases

• the amount of friction.

• the change in direction.

• the force.

• the distance an object moves.

Which of the following actions do more work on an object?

(Use your formula W=FxD)

• lifting a 100 N box 1.5 m up off the floor

• lifting a 90 N box 2 m up off the floor

• lifting a 160 N box 1 m up off the floor

• lifting an 80 N box 1 m up off the floor

Suppose you live on the top floor of the Lake Point Tower in Chicago, 195 m above the ground. If your weight is 500 N, what minimum amount of work must the elevator do to lift you from the ground floor to the top floor?

(W=FxD)

• 305 J

• 97,500 J

• 695 J

• 2.5 J

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