1. Momentum & Impulse Think of P as in Pmomentum

2. Momentum & Impulse Momentum = m x v, it’s a vector, P = m x v Remember F = ∆ P/ ∆ time = m ∆v/∆t = ma Impulse is defined as F∆t = Force x time. F∆t = m∆v, this is the impulse =momentum theorem, an impulse causes a change in momentum (big deal)

3. Momentum and Impulse F∆t = m∆v This is often used when you’re trying to find the average force during a short interval of time, you can use the change in momentum. For example, like hitting a golf ball, the force happens over a short time and it’s very non- linear, but you can determine the average force if you know the change in momentum.

4. Conservation of momentum For Momentum Conservation, This “rule” works for 2 objects colliding or interacting. ∑(mv)before = ∑(mv)after Typically 3 cases – A moving object runs into a stationary object. – Objects “explode” away from each other, both starting at rest – Both objects moving, then colliding

5. Elastic and Inelastic Collisions In a pure Elastic collisions, 2 objects bounce off each other and Kinetic Energy is conserved, meaning the total KE before = total KE after (KE = ½ mv**2). Inelastic collisions, objects stick together, KE is not conserved. In either case, can still use conservation of Momentum to determine velocities.