Lecture 17

# Lecture 17 - Lecture 17 pls-17.1 Impulse Momentum and...

This preview shows pages 1–3. Sign up to view the full content.

Lecture 17 pls-17.1 Impulse, Momentum, and Center of Mass Media: 1. Foam shape with red dot 2. Ping-pong and tennis balls 1. Impulse – Momentum Theorem Let’s consider a “short-time” interaction between two objects, a baseball bat and a ball, for example. If we multiply the average force F by the time interval t over which the force acts, we obtain the impulse J r t = F J r r Let’s consider the net impulse on an object of mass m , t net net = F J r r . Now N’s 2nd law tells us that t m m m i f net = = v v a F r r r r where i v r and f v r are the initial and final velocities of the object. Thus we have i f net m m v v J r r r = t F ( t ) t F

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Lecture 17 pls-17.2 The product v r m is known as the momentum p r of the object, and so this last equation can be succinctly written as i f net p p J r r r = These last two equations are known as the impulse-momentum theorem . Given the definition of impulse
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

Lecture 17 - Lecture 17 pls-17.1 Impulse Momentum and...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online