PHYS 1111L Lecture Notes - Lecture 3: Net Force
Document Summary
Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the si unit of newtons and represented by the symbol f. The original form of newton"s second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time. Concepts related to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque, which produces changes in rotational speed of an object. In an extended body, each part usually applies forces on the adjacent parts; the distribution of such forces through the body is the internal mechanical stress. Such internal mechanical stresses cause no accelation of that body as the forces balance one another.
