What is the formula for momentum?
p=mv
What is the difference between an inelastic collision and an elastic collision?
The kinetic energy in an elastic collision is conserved, whereas it is not during inelastic collisions.
What is true of all closed system collisions?
The total momentum of the system is conserved.
What is the center of mass?
The weighted average of the locations of objects/balance point of the system/center of density or something similar.
Impulse is equal to what 2 things?
Force times time and change in momentum.
Momentum has units of what?
kg m/s
Create a graph showing (a) the velocity of car X over time and (b) the velocity of car Y over time.
You just gotta know this one Schaefer.
the 1 kg block comes to a stop. Determine the post collision speed of the 2 kg block.
1.5 m/s.
What is the center of mass velocity?
The speed at which the center of mass for a system of objects moves.
A 60 N force is applied to a 40 kg object for 3 seconds. Given that the the object started off moving at 20 m/s and the force is applied in the same direction as the object's motion, what is the object's final speed?
24.5 m/s
What does it mean when we say that momentum is a vector quantity?
It has direction as well as magnitude (size).
A train car of mass m traveling with a speed of v collides with a stationary train car of mass 3m. The cars stick together in the collision. How does the speed of the connected cars compare to the initial speed v? How does the kinetic energy of the system after the collision compare to the initial kinetic energy? (Increase, equal, or decrease?)
Both will be less.
If the balls collide and stick together, what is the post collision speed of the balls?
0 m/s
How do you calculate the velocity of the center of mass?
Total system momentum/Total system mass
What is the impulse delivered over this graph?
60 N*s
How much momentum does a 25 g marble rolling at 2 m/s have?
0.05 kg m/s
The two blocks collide and stick together.
Calculate how much energy the blocks lose.
m0=10 kg, v0= 4 m/s
480 J
A 0.1 kg dart is thrown upwards into the bottom of a 1 kg wooden block, sticking to it. It hits the block travelling at 4 m/s. How high will the block/dart combo rise?
0.031 m or approx. 3 cm.
The following closed system collision occurs. What was the center of mass velocity before the collision.
1 m/s. Closed system, so center of mass velocity is the same.
Calculate the change in momentum for a 6 kg object.
- 18 kg*m/s
What is the total momentum of all objects in the universe?
Zero
Block X has 2 kg of mass. Find the mass of block Y.
6 kg
A 1 kg cart travelling at +4 m/s strikes a stationary 2kg cart. After the collision the 1 kg cart has a velocity of -1 m/s, and the 2 kg cart has a velocity of +2.5 m/s. PROVE whether the collision was elastic or not.
MUST show that Ki=/=Kf
Find the total change in momentum.
-3 kg*m/s