A big ball, mass M=10m, speed v, strikes a small ball,
mass m, at rest. Could the following occur: The big ball
comes to a complete stop and the small ball takes off with
speed 10v?
10
m
v
m
m
10Mm
10v
A: Yes, this can occur.
B: No, it cannot occur because it would violate
momentum conservation
C: No, it cannot occur because it would violate
conservation of energy. Two people on roller blades throw a ball back and forth.
After a couple of throws, when the first thrower once
again is holding the ball, they are (ignore friction)
A: standing still, where they were initially.
B: standing still, farther away from each other.
C: standing still, closer together than initially.
D: moving away from each other.
E: moving toward each other. If all three collisions in the figure shown here are totally
inelastic, which bring(s) the car on the left to a halt?
A: I
D: II,III only
B: II
E: All three.
C: III Suppose you are on a cart, initially at rest on a track with
very little friction. You throw balls at a partition that is
rigidly mounted on the cart. If the balls bounce straight
back as shown in the figure, is the cart put in motion?
A: Yes, it moves to the right.
B: Yes, it moves to the left.
C: No, it remains in place.
Collisions
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