1. Physics Enriched Dr. Vetrone A vector quantity with the direction matching that of the velocity.

2. Which object has more momentum, why? SI Unit: kgxm/s Answer: The truck has more Mo bc it has more mass than the parked car. or 1. 2. Answer: The truck has more Mo bc it has a faster velocity.

3. How does mo of an object change if you: a. Double it’s mass?2mv=2P b. Double it’s speed?m2v= 2P c. Double mass and speed? 2m2v=4p or Answer: The two apples have more Mo bc they have more mass even thought the speed 4 both is the same.

4. When is momentum conserved in a collision? 3. Impact f and contact t are the same for both objects t1=t2 & F1t1=F2t2 When there is no outside force that affects the motion of the objects* Ex: Friction, Air resistance, et + 1. Physical contact not required. (ex: electrons) 2. It is a brief force interaction between 2 masses that’s always the same F1=F2. When’s Mo conserved in a Collision?

5. Total KE energy b-4 = Total KE energy after (½ m1)(v1)sqrd. + (½ m2)(V2)sqrd. = (½m1)(v1,f)sqrd + (½ m2)(v2,f)sqrd No heat sound or other energies are transferred. (only KE) * No change in physical shape Total energy of objects is not the same b4 & after collision Some or all KE changed to heat or sound. Stuck together or deformed. sticky

6. 1-D M1V1 + M2 V2 = M1 V1f + M2V2f P1+P2=P2f + 2-D X Y M1V1x + M2V2x = M1V1fx + M2V2fx P1x + P2x = P1fx + P2fx M1V1y + M2V2y = M1V1fy + M2V2fy P1y+ P2y = P1fy + P2fy P2 Acceleration greatest for least mass (A1=F/m1) (A2= F/m2) P1

7. -Is how to Mo(P) Two things to Mo: 1.An objects ______ or ________. 2.You need impact _______ and contact __________. Forcetime Speed mass Formula:Impulse: Final Momentum – initial momentum = impact force x contact time 3 ways to be impulsive (no repulsive) 1. Large force, long time F x t = m V Biggest in Mo (follow throw in sports )

8. 2. Large force, short time F x t = m v * Big force will be needed if very short abrupt collision 2. Long time, small force Egg doesn’t break because of extra give (time) due to the pillows