Force
Define force
A push or pull
Why is friction a contact force?
Example: It occurs between objects that are touching
Define attract
To pull together
Define Motion
A change in the position of an object
In what direction does friction act?
In the opposite direction of the motion
Does magnetism act on all objects?
No
When do we use a large force?
It takes a larger, stronger force to move heavy objects
How is friction helpful?
It helps brakes stop a bike, it helps shoes push off the floor to walk.
Does gravity act on all objects ?
Yes
When do we use a small force?
It takes a small force to move light objects, such as a small piece paper.
How is friction harmful?
Friction between the moving parts in an engine can cause it to wear out.
What is gravity?
a pulling force between two objects
What are some examples of a force changing the motion of an object?
Example: Lifting a book off a table, throwing a ball, pushing a swing, pulling a wagon
What types of surfaces typically have have the least friction between them?
Smooth, slippery surfaces
What is a magnet?
An object with magnetic force