![]() In an extended body, each part often applies forces on the adjacent parts the distribution of such forces through the body is the internal mechanical stress. The rotational version of force is torque, which produces changes in the rotational speed of an object. ![]() Types of forces often encountered in classical mechanics include elastic, frictional, contact or "normal" forces, and gravitational. It is measured in the SI unit of newton (N) and often represented by the symbol F.įorce plays a central role in classical mechanics, figuring in all three of Newton's laws of motion, which specify that the force on an object is equal to the product of the object's mass and the acceleration that it undergoes. Because the magnitude and direction of a force are both important, force is a vector quantity. The concept of force makes the everyday notion of pushing or pulling mathematically precise. In physics, a force is an influence that can cause an object to change its velocity, i.e., to accelerate, unless counterbalanced by other forces.
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