Forces are measured in Newtons (N)
If two forces of the same size act in opposite directions on an object they are said to be balanced.
If the forces acting in opposite directions are different they are said to be unbalanced.
If there is more than on force in one line, they can be added together to give a total force. This total force is called the resultant force.
Unbalanced forces result in a change in a body's motion whereas balanced forces do not.
The acceleration of a body is directly proportional to the resultant force and inversely proportional to the body's mass, which can be seen in the equation:
Force = Mass x Acceleration
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