Unit 3 Review Work & Simple Machines

How can you decrease the effort force needed to push a weight to the top of the ramp? 

• cover the surface with carpet
• increase the length of the ramp
• increase the height of the ramp
• decrease the length of the ramp

How does a single fixed puled, like the one seen here, help you do work?

• changes the direction of the force
• increases the amount of applied force
• decreases the amount of applied force
• allows you to pull the rope a shorter distance

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Barbie sits on one end of a see-saw and Ken sits on the other. Barbie goes up in the air and Ken stays down on the ground. In order for Ken to make Barbie move down, he should

• stand on the board
• push down on the board
• move towards the center
• move away from the center

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The amount by which a machine multiplies input force is known as the 

• work.
• power.
• output force.
• mechanical advantage.

Mechanical advantage is a measure of how much a machine multiplies the input

• efficiency.
• force.
• power.
• work.

What is the mechanical advantage of the block and tackle used to lift the bale of cotton?

• 1
• 2
• 3
• 4

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What is the primary mechanical advantage of using the simple machine seen in the image?

• You can apply a small input force and have it multiplied into a large output force.
• You can apply a large input force and have it multiplied into a small output force.
• You can apply a small input distance and have it multiplied into a large output distance.
• You can apply a large input distance and have it multiplied into a small output distance.

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The unit used to measure work is the 

• Watt
• Newton
• Joule
• meter

A ______________ is a rope or chain wrapped around a wheel. 

• wedge 
• lever 
• pulley 
• screw

Any device that makes work easier is called a ______________________.

• Joule 
• prop
• lever
• machine

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