Momentum and Impulse. Momentum. Momentum . Inertia/mass in motion Symbol- p Equation p = mv Units: kg • m/s VECTOR. inertia. In motion. A large truck has more momentum than a car moving at the same speed because it has a greater mass.
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evil physicist who gave you the following choice:
p = mv = (2500 kg)(18 m/s) = 45000 kg m/s
4.68 kg m/s
p = mv v = p/m (4.68)/(7.3) = 0.64 m/s
Change in momentum
Example: Wall exertsa force of 10,000 N.The contact time is0.01 s.------------------------------Impulse = F t = 100 N-s
By swift execution she makes the time of contact very brief and correspondingly makes the force of impact huge!
If her hand is made to bounce upon impact, the force is even greater!
Δ v of rubber ball is greater so impulse must be greater
Momentum Before = 0-------------MomentumAfter = 0-------------After firing, the oppositemomentacancel.
m1v1i + m2 v2i = m1 v1f +m2v2f
**note that there are TWO final velocities**
m1v1i + m2 v2i = (m1+m2)vf
2. A 200kg motorcycle slows from 10m/s to 5 m/s.
a. What is the change in momentum?
b. How much impulse is required to change the momentum?
c. If the impulse was applied for 2 seconds, how much force was applied?
3. A huge rugby player rams into a smaller player and knocks him 5m away. What type of collision is this?