PHYSICS 5A Lecture Notes - Lecture 16: Free Body Diagram, Isolated System, Net Force
Document Summary
The velocity decrease once the ball came into contact with the ball. Notes that kinetic energy = not elastic aka inelastic. The application of a force over a time t causes a change in the object"s momentum. To solve problems, we use the impulse approximation (when you ignore other forces because the forces between objects are usually large) Example: imagine two skaters on ice; they push off each other i. e. they apply a force over a short time t. If we let j 1 = impulse on 1 and j 2 = impulse on 2, we know that j 1 = P 1 + p 2 = 0 p 1 + p 2 = constant. The total momentum of the two skaters is constant. This principle is known as the conservation of momentum. You can treat 1 and 2 as one object. Internal force : when you consider two objects as one therefore for.
