Forces in action
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1. What is a force?

“FORCES ARE INVOLVED WHENEVER OBJECTS INTERACT”


• A force is just a push or pull that one object exerts on another object. Examples:
– an object’s weight
– friction
– tension in a rope
– attraction between an electron and proton.

Bodies don’t have to be in contact to exert forces on each other, e.g., gravity.

• The SI unit of force is the newton (N).

THE EFFECT OF A FORCE:

Force is an action or agency that causes a body of mass m
- a deformation
- a rotation
- an acceleration
- or an increase in pressure for the body.

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