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Learn what the resultant force (also known as net force) is, and how to find it when an object is subject to parallel forces as well as non-parallel forces with the help of examples.
The Moment of a Force. When we consider cases where forces act on a body of non-zero size (i.e. not a particle), the main new aspect that we need to take account of is that such a body can rotate, as well as move through space, under the action of forces.
A resultant force is a single force that describes all of the forces operating on a body. When multiple forces act on one object, the forces can be combined to produce one net force that describes the combined action of all of the forces. This single resultant force determines:
The force arising when an object rests against another object acting at a 90° angle to the plane of contact. It is sometimes also referred to as the reaction force. This is normally labelled as N or R on free body diagrams. This force arises from Newton's Third Law.
On the grid below draw a scale diagram to determine the resultant force acting on the body. Use a scale of 1 cm to 1 N.
A resultant force is a single force which replaces several other forces. It has the same effect acting on the object as the combination of the other forces it has replaced.
Force System Resultants. Sections 4.1-4.4 Introduction to Moments. A moment is a measure of the tendency of a body to rotate (also called a torque). This tendency to rotate occurs at a point that is not on the line of action of force that is applied to a body. In a 2D plane, the moment about a point O is found by: =
