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Conservation Of Momentum
Test Description: Questions on the conservation of momentum, elastic and inelastic collisions and bouncing
Instructions: Answer all questions to get your test result.
1) The definition of the law of conservation of momentum is:
A
In the absence of an external force, the momentum of a system remains unchanged.
B
The momentum of a system can never change.
C
In the presence of an external force, the momentum of a system remains unchanged.
D
Ft=Δ(mv)
2) Another definition of the law of conservation of momentum is:
A
The momentum of a system before an event is equal to the momentum after the event.
B
The momentum of a system before an event involving only internal forces is equal to the momentum after the event.
C
The product of the mass of an object and its velocity
D
The product of the force acting on an object and the time during which it acts.
3) Which of the following is true of systems?
A
All of these.
B
A system is the object or group of objects a physicist is studying.
C
A system can be as small as a single atom.
D
A system can be as large as a galaxy.
4) If a system is a soccer ball, then which of the following forces would be internal to the system?
A
The force of one atom inside the soccer ball colliding with another atom.
B
The force of a player's foot on the soccer ball.
C
The force of air drag on the ball as it flies through the air.
D
The force of gravity on the soccer ball.
5) The definition of an elastic collision is:
A
A collision in which objects rebound without lasting deformation or the generation of heat.
B
Neither of these.
C
Both of these.
D
A collision in which the colliding objects become distorted, generate heat, and possibly stick together.
6) An example of an elastic collision is:
A
When two pool balls collide and fly off in different directions.
B
When two atoms collide so violently that they explode.
C
When two cars crash into each other.
D
When your physics teacher gets mad and throws a piece of clay at the wall, to which the clay sticks.
7) An inelastic collision is:
A
Both of these.
B
A collision in which the colliding objects become distorted, generate heat, and possibly stick together.
C
Neither of these.
D
A collision in which the colliding objects rebound without lasting deformation or the generation of heat.
8) An example of an inelastic collision is:
A
When your physics teacher gets mad and throws a piece of clay at the wall, to which the clay sticks.
B
All of these.
C
When two cars crash into each other.
D
When two atoms collide so violently that they explode.
9) Which of the following statements is most true about bouncing and impulse, given two objects of the same mass?
A
The object that bounces undergoes a smaller change in momentum.
B
The object that doesn't bounces undergoes no change in momentum.
C
The object that bounces imparts a smaller impulse to whatever it bounces off.
D
The object that bounces imparts a greater impulse to whatever it bounces off.
10) Which of the following scenarios involves the greatest change in momentum?
A
A soccer ball is caught.
B
The change in momentum is the same in each case.
C
A soccer ball is thrown.
D
A soccer ball is caught and then thrown.
11) When a falling object bounces as it hits the ground
A
the impulse on it is greater than for stopping it.
B
None of these.
C
its change in momentum is greater than for stopping.
D
Both of these.
12) Nets used to catch falling boulders on the side of rocky hillside roadways are more effective than rigid fences because their breakage is reduced by
A
less momentum of falling rocks.
B
more time to change the momentum of falling rocks.
C
less impulse of falling rocks.
D
less time to change the momentum of falling rocks.
13) Standing still on a skateboard, you catch a ball tossed horizontally to you. The mass of the ball is one-tenth your mass. Compared with the speed of the caught ball, the speed that both you and the caught ball acquire is
A
one-tenth as much.
B
10 times as much.
C
100 times as much.
D
the same.
14) When Jake tosses a ball while standing still on his skateboard, he and his skateboard recoil. If he goes through the motions of tossing the ball, but doesn’t toss it, his net recoil will ideally be
A
almost as much as if he threw the ball.
B
zero.
C
the same as if he threw the ball.
D
very small.
15) When you say momentum is conserved, you mean that
A
when external impulses don’t occur, a system’s momentum remains the same before and after an interaction.
B
momentum can be stored.
C
when two objects collide, the mass and velocity of each object will not change.
D
when an impulse acts on an object, its momentum will change.
16) In the absence of external forces, momentum is conserved in
A
an inelastic collision.
B
neither an elastic nor an inelastic collision.
C
an elastic collision.
D
either an elastic or an inelastic collision.
17) A big fish coasts up to and swallows a small fish at rest. Right after lunch, the speed of the big fish is
A
more than before.
B
zero.
C
less than before.
D
the same as before.
18) A big fish swims up on and swallows a small fish at rest. Right after lunch, the momentum of the big fish is
A
less than before.
B
more than before.
C
zero.
D
the same as before.
19) A piece of clay moving with one unit of momentum strikes and sticks to a heavy bowling ball initially at rest. After the clay sticks, both the clay and ball ideally move with a combined momentum of
A
more than one unit.
B
one unit.
C
much less than one unit.
D
a little less than one unit.
20) A pair of spiral galaxies collide and merge to form one larger elliptical galaxy. Astronomers assume that the momentum of the new elliptical galaxy is
A
equal to the sum of the momenta of two spiral galaxies.
B
zero.
C
equal to the difference in momenta of the two spiral galaxies.
D
the same as the momentum of the more massive spiral galaxy.
*select an answer for all questions
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