PLTW POE Unit 1.1 Review

There are _____ simple machines

• 4

• 5

• 6

• 7

Simple machines help us by changing the magnitude or direction of the _____

• Force

• Motor

• Axle

• Fulcrum

The _____ is the input force which must be supplied by the user or engine

• Effort

• Resistance

• Load

• Push

The fixed point of rotation on a lever.

• Fulcrum

• Center

• Wedge

• Pivot

• 1st Class
• 2nd Class
• 3rd Class
• It is not a lever

• 1st Class
• 2nd Class
• 3rd Class
• It is not a lever

• 1st Class
• 2nd Class
• 3rd Class
• It is not a lever

• 1st Class
• 2nd Class
• 3rd Class
• It is not a lever

What is mechanical advantage?

• The advantage a machine has over a bicycle

• A measure of how much a simple machine reduces work

• A measure of when is the best time to use a simple machine

• The number of times a machine increases input force

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (MA=Effort Arm/Load arm)?

• 0.5

• 2

• 3

• 6