Internal and External Forces

What is the difference between and internal force and an external force? Use examples to help explain your thinking. Write in full sentences with proper grammar and punctuation.

How many internal forces did we learn about in class?

• 1

• 4

• 3

• 2

What is an example of an external force?

• tornado

• compression

• a building collapsing

• people standing inside of a building

Tension is a PUSHING force that causes structures to DECREASE in size.

• True

• False

Tension is a PULLING force that makes structures and objects INCREASE in size

• True

• False

Compression is a PUSHING force that causes structures to DECREASE in size.

• True

• False

Think about wringing out a really wet cloth, like in the image. What kind of force can this action be classified as?

Think about chewing. Your top teeth and bottom teeth move in opposite directions. What kind of force is this?

An example of a live load would be a car on a bridge

• True

• False

An example of a live load would be you sitting on a chair

• True

• False