2. Momentum
September 21, 2010

3. Momentum Linear Angular In all cases, momentum is CONSERVED.
A vector that depends on two physical quantities: the mass and the velocity of the moving object
Angular
The momentum of a rotating object (not covering this yet)
In all cases, momentum is CONSERVED.
FORMULA: p = mΔv

6. Conservation of Momentum
the total momentum of a closed system of objects is CONSTANT
pi = pf
mΔvi = mΔvf
If there are 2 objects…
m1Δvi1 + m2Δvi2 = m1Δvf1 + m2Δvf2
In collisions, we will have to break down momentum into x & y dimensions
pix = pfx
piy = pfy

8. Impulse
An impulse is a force given to an object over a change in time. This impulse changes the objects momentum.
Momentum (our next unit) is found by multiplying an object’s mass by its velocity
Impulse = the variable “J”
J = Ft = mv
We need to include impulses in our F equations

11. Conservation of Energy
In all processes, energy is conserved
Ei = Ef
We are going to look at 2 types of energy
Kinetic= the energy of motion= ½ mv2
Can an object have kinetic energy if it is at rest?
Potential = the energy of position = mgh
=(mass)(10m/s2)(height)
If something is at ground level, will it have potential energy?
KEi + PEi = KEf + PEf
½ mvi2 + mghi = ½ mvf2 +mghf