# Equilibrium and resultant forces

summary of topic in respect to WJEC syllabus

- Created by: Olivia
- Created on: 07-06-11 23:13

First 146 words of the document:

Equilibrium and resultant forces

Resolving forces

Forces can be resolved by splitting them into 2 components

Going through the angle then the components is Fcos otherwise it

is Fsin.

Components in parallel direction can be added( or subtracted if they

are in opposite directions)

Resultant forces

The combination of 2 components is a resultant force

F = x2 + Y 2

Where x is horizontal component and Y is the vertical component.

The angle, , the resultant makes with the horizontal (its direction) is

= tan-1 ( Y

X )

If an object is said to be in equilibrium then the sum of the forces acting on the object

must be zero. This means that when you resolve the forces into perpendicular components

then the sum of the forces in each perpendicular direction must also be zero.

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