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FORCE & EQUILIBRIUM

Force

Commonly imagined as a push or pull on an object

Vector quantity May be a contact force or a

field force SI unit of newton (N)

Pushing Force

Compressive force Creates compression

Pulling Force

Tensile force Creates tension The tension is the same at all points in

the rope

Contact Force

Results from physical contact between two objects

Field Force

Acts between disconnected objects

Characteristics of a Force

Magnitude Direction Point of Application

Effects of Force

1. Changes the state of motion of a body

- accelerates the body

2. Deformation

- mass is the same but volume changes

Equilibrium

Possessed by a body that is either at rest or moving in a constant velocity

The net force acting on the object is zero,

0F

Static Equilibrium

The equilibrium possessed by bodies at rest.

The velocity of the body is zero.

Dynamic Equilibrium

The equilibrium possessed by bodies in motion.

The velocity of the body does not change; its acceleration is zero.