Pretest

Question 1

Julian stands on his toes to lift his body high enough to reach a book. In this example, what do Julian’s toes function as?

Revolt · Accepted Answer

a fulcrum

Question 2

Which two simple machines can be found in a bicycle?

Revolt · Accepted Answer

a lever and a wheel and axle

Question 3

Ellen needs to move a heavy box across the floor and then place it on a shelf that is four feet above the floor. Which use of machines would most likely require the least amount of force in order to get the box on the shelf?

Revolt · Accepted Answer

rolling the box up an inclined plane on a cart

Question 4

A lever has a total length of 12 meters with a fulcrum at the exact center of the lever. Which best describes how to double the mechanical advantage of the lever?

Revolt · Accepted Answer

Move the fulcrum 2 meters toward the side on which the force is applied.

Question 5

Teeth are an example of which type of simple machine?

Revolt · Accepted Answer

wedge

Question 6

Which simple machine turns about a fixed point called a fulcrum?

Revolt · Accepted Answer

a lever

Question 7

What is the mechanical advantage of an inclined plane that has a length of 9 feet and a height of 3 feet?

Revolt · Accepted Answer

3

Question 8

Which is a compound machine?

Revolt · Accepted Answer

a pair of scissors

Question 9

A screw has 4 threads per centimeter and a circumference of 2 centimeters. What is the mechanical advantage of the screw?

Revolt · Accepted Answer

8

Question 10

Which best explains what will happen if Sharilyn unscrews a bolt with a short handled wrench?

Revolt · Accepted Answer

The bolt will be harder to unscrew because it is closer to the fulcrum and the mechanical advantage will be reduced.

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