Force

Definition: it is either a push or pull that one object exerts on the other object.

SI Unit: Newton (N)

Vector quantity

Effect
(1) Start an object moving.
(2) Stop a moving object.
(3) Change the direction and speed of a moving object.
(4) Change the size or shape of an object.

Types
(1) Contact-forces which exist between objects when they are in contact. e.g friction, tension
(2) Non-contact forces which act at a distance => objects are not in contact with each other. e.g magnetic force, electric force, gravitational force

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