1. Linear Momentum and Collisions.
Physics 150/215 Lesson 7
Linear Momentum and Collisions.
Definition of linear Momentum
Units of Force and Momentum
Newtons 2 nd Law in terms of Momentum
Law of Conservation of Momentum
Collisions
Perfectly Elastic
Completely Inelastic
Center of Mass and Gravity 1

2. Mass multiplied by Velocity
Momentum is defined as
Mass multiplied by Velocity 2

3. 3

4. Force = Rate of Change of MomentumD p F = D t
This is Newtons second law in terms of
momentum ( ) D p D m v m D v F = = = = m a D t D t D t 4

5. Impulse produced by a force
is change of momentum produced by that force 5

6. Total Momentum of System of many
Particles . . e. g. 4 4 å P = p + p p p + + = p
Total 1 2 3 4 i
i = 1 6

7. for a closed set of particles
Momentum is conserved
for a closed set of particles 7

8. Kinetic Energy is conserved Objects stick together after impact
Collisions
Perfectly Elastic
Completely Inelastic
Kinetic Energy is conserved
Objects stick together after impact 9

9. Perfectly Elastic Collision
Examples
Perfectly Elastic Collision
Completely Inelastic Collision

10. Center of Mass Point
is the point where all the mass of a system can be considered to be concentrated
Center of Gravity
Is the point at which all the weight of a system can be considered to be concentrated
1 0

11. 1 1

12. P = M v thus D P F = = M a D t Total Total center Total Total Total
1 2