What is gravitational force?

The force that pulls a person to Earth.

What is magnetic force?

How a magnet is attracted or pushed by another magnet.

How do we measure forces?

We use Newtons (N). Can measure it using spring force.

Gravity is an attractive force that...

Pulls objects together, is stronger with objects with more mass, is stronger when objects are closer together.

What are resistive forces?

Forces that oppose the movement of an object. (ex. friction)

What are the two types of drag?

Air resistance and water resistance.

What are the two types of friction?

Static friction (stops something from moving) and kinetic friction (slows something down)

What is Newton's 2nd Law?

Force equals mass times acceleration (F = ma)

What are the 6 simple machines?

Lever, wheel and axle, pulley, inclined plane, wedge, screw.

What can simple machines do?

Change the size of a force, make things speed up and change the direction of a force.

What are some examples of the inclined plane?

Skateboard ramp, slide, funnel, roof.

What is a mechanical advantage?

The measure of a machine's ability to multiply or amplify force. (make it easier to push or pull)

What is a fulcrum?

The turning point of a lever (the pivot point that remains stationary)

What is a load in reference to a lever?

The object that has to be moved.

What is the effort in reference to a lever?

The force used to move a load.

Class one of the lever.

Load, fulcrum, effort. (LFE) Force multiplier.

Class two of the lever.

Effort, load, fulcrum. (ELF) Force multiplier

Class three of the lever.

Load, effort, fulcrum (LEF). Speed multiplier.