Momentum and Conservation of Momentum in Physics: Chapter 9 - Prof. Wolfgang Losert, Study notes of Physics

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Phys171 – Fri 3/

Today: Chapter 9

Midterm returned next week Mon or Thu

Fri/Mon/Tue Chapter 9

Action-reaction

Not self supporting Nature, 387 (1997)

self supporting

Conservation laws

Forces (F) Motion (x,v,a)

F =ma

G G

W = F Δr

G G

i Energy/Work

(^12) 2

E mv E mg r

= = Δ

Momentum

Chapter 9: Momentum

(Linear) momentum of an object of mass m

moving with a velocity v:

p = m v

The total momentum of n objects:

Key concept: Conservation of momentum

n i i i

P = ∑m v

A compact car and a large truck collide on an icy road head on and stick together. Which undergoes the larger momentum change?

1. Car
2. Truck
3. The momentum change is the same for both vehicles.
4. Can’t tell without knowing the final velocity of combined mass.