11/6/08

Post date: Nov 05, 2008 8:51:40 PM

Bell Activity: What does the word "impulse" mean?

• • Impulse-Momentum theorem

    • If a constant force is applied to something over a period of time, we call the product of force and time the impulse

    • If the mass of an object is constant, then the impulse is equal to the change in momentum of the object

    • Equation: Force x time = change in momentum or Force x time = mass x change in velocity

    • See page 177 for the symbols in this equation

    • Example: A baseball being hit by a bat (page 178)

    • Application question: Why are we taught to follow through when we swing a bat?

• Practice: Page 178, problems 2-4 due Friday

Page 178: 1-4 Due Friday