Momentum
What is momentum?
The mass of an object and how fast it is moving
What is an elastic collision?
A collision in which the two objects bounce off of each other
What is an inelastic collision?
A collision in which the two objects stick together
What is impulse?
A force applied over time
What is the law of conservation of momentum?
The total amount of momentum must remain the same.
What is the equation for momentum?
P=Mv
What is the equation for an elastic collision?
m1v1+ m2v2 = m1v1f + m2v2f
What is the equation for an inelastic collision?
m1v1 + m2v2 = (m1+m2) V
What are the units of impulse?
NS
Which types of collisions conserve momentum?
All collisions.
What are the units of momentum?
kg m/s
What are the units of momentum in an elastic collision?
kgm//s
What are the units of an inelastic collision?
kgm/s
What is a change in momentum?
An object speeding up, slowing down or changing direction
Momentum is conserved in an impulse -change in momentum problem; True or False
True
What is the momentum of a dog of mass 50 kg that is running at 8 m/s?
400 kgm/s
A 5 kg cart that is traveling at 4 m/s hits a stationary 4 kg cart. Of the 5 kg cart stops, what speed does the 4kg have after this collision?
5 m/s
A 20 kg girls is running at 8 m/s. She jumps onto a stationary 2 kg skateboard. How fast do the girl and the skateboard travel afterwards?
7.3 m/s
What is the equation for impulse?
Fxt
The law of COM is used in designing cars and making them safer/ True or False
True
What is the mass of a boat that has 4200 kgm/s of momentum and is traveling 7 m/s?
600 kg
A 2000 kg car is traveling 4 m/s when it hits a 1000 kg car that is stopped. If the 2000 kg car stops, what is the speed of the 1000 kg car after this collision?
8 m/s
What is transfered in an inelastic collision?
momentum
What is the equation for change in momentum?
Mx (delta)V
Air bags, seat belts, and crumple zones in cars are there to shorten the time and increase the impact force on the passengers/ True or False
False