Phys 140 Class 17/18/ 19: Momentum/Impulse/ Conservation of momentum/Center of Mass Chapter 9.1-9.6

Momentum Formula

P = mv

Vector quantity

What happens if there is Larger Force?

Theres more momentum

Impulse formula

J = mv

J = F(avg)T

Ft =. mv

J = change in P

Average Force Formula:

F = change in p / change in t

F = m(vf - vi) / t

use kg m/s

How can you change the momentum?

By applying a force.

Momentum

measure of the quantity of motion an object has

Conservation of Momentum

Where the total momentum of an isolated system is constant.

ex) Pool

Conservation of Momentum Formula:

Pi = Pf

Perfect Inelastic Collision

Collision is where particles stick together and move together at the same speed.

collisions where total KE is not conserved (transformed to heat).

Elastic Collisions

Collisions where the kinetic energy of a system is conserved.

KEi = KEf

Conservation Laws:

If the value of a physical quantity is constant in time, quantity is conserved.

Explosions:

Pieces breaking up to different pieces.

Object becoming many and increasing the KE of the system.

Center of Mass

weighted average position of the mass\

= m1×1 + m2×2 / (m1+m2)