In physics, the concept of force is used to describe how a mass is affected, be it in form of acceleration or mechanical stress.. Force can also be described by intuitive concepts such as a push or pull that can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Thrust is any force which increases the velocity of the object. Drag is any force which decreases the velocity of any object. The tendency of a force to cause changes in rotational speed about an axis is called torque.Mechanical stress is a technical term for the efforts which cause deformation of matter, be it a solid, liquid, or gaseous. Mechanical stress can remain embedded in a solid object, gradually deforming it. Mechanical stress in a fluid determines changes in its pressure and volume
Applications of Newton's Laws, Part 2: Strings and Pulleys
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.