Momentum and Collision
Quiz by Mark Paulo San Juan
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- Q1
A professional skier reaches a speed of 56 m/s on a 30° ski slope. Ignoring friction, what was the minimum distance along the slope the skier would have had to travel, starting from rest?
640 m
110 m
160 m
320 m
60s - Q2
A 75-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 4.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.20 s, what is the magnitude of the average horizontal force by diver on the raft?
525 N
900 N
450 N
1500 N
60s - Q3
A 0.12-kg ball is moving at 6 m/s when it is hit by a bat, causing it to reverse direction and have a speed of 14 m/s. What is the change in the magnitude of the momentum of the ball?
2.4 kg m/s
0.42 kg m/s
0.39 kg m/s
1.3 kg m/s
60s - Q4
The impulse experienced by a body is equivalent to its change in:
potential energy
momentum
velocity
kinetic energy
60s - Q5
Alex throws a 0.15-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 3.5 m/s. What is the change in the magnitude of the ball's momentum?
0.09 kg m/s
4.3 kg m/s
1.5 kg m/s
123 kg m/s
60s - Q6
Alex throws a 0.15-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 3.5 m/s. If the ball is in contact with the floor for 0.025 s, what is the magnitude of the average force applied by the floor on the ball?
3 N
133 N
60 N
3.5 N
60s - Q7
Jerome pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Jerome with a return speed of 60 m/s. What is the magnitude of change in the ball's momentum?
18 kg m/s
8 kg m/s
4 kg m/s
20 kg m/s
60s - Q8
Lonnie pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for 0.050 s, what is the impulse experienced by the ball?
400 N s
20 N s
360 N s
9 N s
60s - Q9
A ball with original momentum +4.0 kg×m/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is:
8 kg m/s
-4 kg m/s
zero
-8 kg m/s
60s - Q10
If a glass of water is on a table with a piece of paper under it, it is relatively easy to pull the paper out without disturbing the glass very much if the pull is done very quickly. This is because, with a quick pull:
the time for the pull will be less.
the coefficient of kinetic friction will be less.
the momentum of the paper will be greater.
the force on the glass will be less.
60s - Q11
A car wash nozzle directs a steady stream of water at 1.5 kg/s, with a speed of 30 m/s, against a car window. What force does the water exert on the glass? Assume the water does not splash back.
110 N
11 N
45 N
440 N
60s - Q12
The units of impulse (N s) are equivalent to:
N m
those of energy
those of force
kg m/s
60s - Q13
The law of conservation of momentum is applicable to systems made up of objects described by which of the following?
macroscopic
all choices are valid
interacting through friction
microscopic
60s - Q14
If the momentum of an object is tripled, its kinetic energy will change by what factor?
zero
three
one-third
nine
60s - Q15
The kinetic energy of an object is quadrupled. Its momentum will change by what factor?
eight
four
zero
two
60s