Mom (8) - Momentum and Collisions We look at another...

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

View Full Document Right Arrow Icon
10/03/2006 1 Momentum and Collisions We look at another consequence of Newton’s Laws of Motion. This time the emphasis is on Newton’s Third Law. 10/03/2006 2 Newton II rewritten: Acceleration is the rate of change of … Velocity. We call mass times velocity momentum Momentum is a vector. The unit is kg m/s F = ma = m Δ v Δ t = mv f mv i Δ t = p f p i Δ t F = Δ p Δ t p mv 10/03/2006 3 Impulse Multiply both sides by Δ t. Force times time equals impulse. Unit is N s Impulse-momentum theorem: 1 N s = 1 kg m/s F = Δ p Δ t F Δ t = Δ p J = F Δ t 10/03/2006 4 Non-constant forces Can we use the impulse-momentum theorem if the forces are not constant? Yep! The area under the force vs. time curve is impulse. What average force will give the same impulse (area) for the same time? Example: Think about landing from a jump. What makes it easier?
Background image of page 1

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

View Full DocumentRight Arrow Icon
10/03/2006 Problem #1 A boy kicks a football with an average force of 90.0 N for a time of 0.200 s.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

Mom (8) - Momentum and Collisions We look at another...

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

View Full Document Right Arrow Icon
Ask a homework question - tutors are online