Internal and External Forces

How many internal forces did we learn about in class?

• 1

• 4

• 3

• 2

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

A dead load is the force that a structure has on its own.

• True

• False

If these boys are pulling with the same amount of force.  What will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.