Non-contact forces
Non-contact A push or a pull. The unit of force is the newton (N). are forces that act between two objects that are not physically touching each other.
Example: Magnetic force
A Able to be magnetised or attracted to a magnet. force is experienced by any magnetic material in a Area surrounding a magnet that can exert a force on magnetic materials..
Opposite magnetic poles (N - S or S - N) Objects that tend to move together because of a force between them attract each other. each other 鈥 but do not need to be in contact.
Like magnetic poles (N - N or S - S) Objects that tend to push apart because of a force between them repel each other. each other 鈥 but do not need to be in contact.
Key points
- Force is measured in newtons N.
- Force is a vector quantity - direction is important as well as size.
- A force acting in one direction is given a positive value.
- A force acting in the opposite direction is given a negative value.
When forces act between two objects, both objects experience an equal size force, but in opposite directions.
This is Newton's Third Law of Motion.