Momentum/Impulse

We started off class by finishing our notes from monday on Impulse. After we finished our notes we took up questions in our text books Page 243 #1-3.

Ex. What average force will stop a 1.0x10 3 car in 1.5s, if the car is moving at 22m/s?

m=1.0x10 3kg
deltaT=1.5s
vi=22m/s
vf=0
F=?

FdeltaT=mvf-mvi

F=-mvi/deltaT

F=-(1.0x10 3kg)(22m/s)/1.5s

=15,000N

When there was 10 minutes left in class Boss decided to take up more notes on
Law of conversation of Momentum
the total momentum of a closed system does not change.

An isolated system is one in which no net external force acts on the system
Momentum is conserved regardless of whether the iteractions exists in more than one dimension.

Then the bell rang and we ended off class with imcomplete notes that we will proabably take up today.

Mr. Banow has the power to pick who is next because i dont know who is left