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Jeopardy!
Newton’s 3rd Law
Conservation of Momentum
Physics I
Spring 2002
Interactions
Action
Action
Re-action Re-action
2
1
Momentum
Impulse
Conservation
100
100
100
100
100
100
200
200
200
200
200
200
300
300
300
300
300
300
400
400
400
400
400
400
500
500
500
500
500
500
600
600
600
600
600
600
Interactions
100
A single interaction involves _____ forces.
One
Two
Three
Four
None of the above
(b)
Interactions 200
The action and reaction forces referred to in
Newton’s third law of motion
a) Act on the same object
b) Act on different objects
c) Need not be equal in magnitude nor have the
same line of action
d) Must be equal in magnitude but need not have
the same line of action
b
Interactions
300
A Mack truck and a Volkswagen traveling at the same
speed collide head-on. The impact force is
a) The same for both.
b) Greatest on the Volkswagen.
c) Greatest on the Mack truck.
(a)
Interactions 400
The amount of attraction between an object on
or near Earth’s surface and the earth is
called
(a) Gravity
(b) Inertia
(c) Mass
(d) Weight
(e) None of the above
(a)
Interactions
500
When a piece of aluminum foil is crushed
into a ball, which quantity changes?
(a)
mass
(b)
weight
(c)
volume
(d)
inertia
(e)
none of the above
(c )
Interactions 600
On a microscopic level, a string
(a)Transmits force by each individual molecule
pulling and tugging on the next one.
(b)Does not transmit force at all, only on a
macroscopic level
(c)Halves the transmitted force
(d)None of the above
(a)
Action/Reaction I
100
A bicycle smashes into a concrete retaining wall.
Which force is greater?
(a)The bicycle against the wall
(b) The wall against the bicycle
(c) Can’t tell the size of either force since mass and acceleration are
unknown
(d) Forces are of equal size, but in opposite directions
(e) None of the above
(d)
Action/Reaction I
200
As a prospective wrestler, you’re afraid you won’t make
the weight when you need to. What is the best way
to decrease the reading on the scale?
(a) Exhale quickly
(b) Pull up on a nearby table
(c) Push down on a nearby table
(d) It’s impossible; resign yourself to a higher weight
class
(c)
Action/Reaction I 300
An automobile that is towing a trailer is
accelerating on a level road. The force that
the automobile exerts on the trailer is
(a)Equal to the force the trailer exerts on the
automobile
(b)Greater than the force the trailer exerts on
the automobile
(c)Equal to the force the trailer exerts on the
road
(d)Equal to the force the road exerts on the
trailer.
(a)
Action/Reaction I 400
When a horse pulls a wagon, the force that
causes the horse to move forward is the force
(a)The horse exerts on the wagon
(b)The wagon exerts on the horse
(c)The horse exerts on the ground
(d)The ground exerts on the horse
(e)Not described above
(d)
Action/Reaction I
500
A player catches a ball. Consider the action force
to be the impact of the ball against the player’s
glove. The reaction to this force is the
(a)player’s grip on the glove
(b)Friction of the ground against the player’s
shoes
(c)Force the glove exerts on the ball
(d)Muscular effort in the player’s arms
(e)None of these
(c)
Action/Reaction I
600
A player hits a ball with a bat. The action force
is the impact of the bat against the ball. The
reaction to this force is the
(a)Weight of the ball
(b)Grip of the player’s hand against the ball
(c)Force of the ball against the bat
(d)Air resistance on the ball
(e)None of these
(c)
Action/Reaction II
100
As a ball falls, the action force is the pull of the
earth’s mass on the ball. The reaction force
is the
(a)Air resistance acting against the ball
(b)Acceleration of the ball
(c)Pull of the ball’s mass on the earth
(d)Non-existent in this case
(e)None of these
(c)
Action/Reaction II
200
A Mack truck and a Volkswagen traveling at the
same speed collide head-on. The vehicle to
undergo the greatest change in velocity
will be the
(a)Volkswagen
(b)Mack truck
(c)Same for both.
(a)
Action/Reaction II
300
A baseball player bats a ball with a force of
1000 N. The ball exerts a reaction force
against the bat of
(a)Less than 1000 N
(b)More than 1000 N
(c)1000 N
(d)Sometimes more than 100 N, sometimes less
than 1000 N
(e)None of the above are true
(c)
Action/Reaction II 400
A gun recoils when it is fired. As the gases from the
gunpowder explosion expand, the gun pushes the
bullet forwards and the bullet pushes the gun
backwards. The acceleration of the recoiling gun is
...
(a)Greater than the acceleration of the bullet
(b)Smaller than the acceleration of the bullet.
(c)The same size as the acceleration of the bullet.
(d)Impossible to determine from the information
provided
(e)None of the above.
(b)
Action/Reaction II
500
According to Newton’s third law, if you push gently
on something, it will push
(a) Gently on you
(b) Gently on something else
(c) On something only under the right conditions
(d) On you only if you aren’t moving
(a)
Action/Reaction II 600
These books are resting on
the table. What is the net
force acting on book Y?
(a)4 N down
(b)5 N down
(c)5 N up
(d)10 N up
(e)zero
4N
X
5N
Y
Z
10 N
(e)
Momentum
100
If a ball with a velocity of 50 m/s has the same
momentum as that of a 10-kg rock having a
velocity of 20 m/s, the mass of the ball is
(a)Greater than 10 kg
(b)Less than 10 kg
(c)10 kg
(d)Impossible to predict from the given data
(e)None of the above
(b)
Momentum 200
Momentum can be calculated by multiplying
mass by
(a)Acceleration
(b)Velocity
(c)Impulse
(d)Time
(e)None of the above
(b)
Momentum
300
Which has more momentum, a large truck moving at
30 miles per hour or a small truck moving at 30
miles per hour?
(a)The large truck
(b)The small truck
(c)Both have the same momentum
(a)
Momentum
400
Compared to a sports car moving at 30 miles
per hour, the same sports car moving at 60
miles per hour has
(a)The same momentum
(b)Twice as much momentum
(c)Four times as much momentum
b
Momentum
500
If the momentum of an object changes and
its mass remains constant then
(a) Its velocity is changing.
(b) It is accelerating or decelerating
(c) There is a force acting on it
(d) All of the above
D
Momentum 600
If Superman at rest in free space throws an asteroid
that has more mass than Superman, then which
moves away faster?
(a) The asteroid
(b) Superman
(c) They both move at the same speed.
b
Impulse
100
Impulse can be represented by
(a) Dv/Dt
(b) FDt
(c) mv
(d) ma
(e)None of these
a
Impulse
200
A Ping-Pong ball gun is fired. Compared to the
impulse on the ball, the amount of impulse on
the gun is
(a) Larger
(b) Smaller
(c) The same
c
Impulse
300
If no net force acts on a body then
(a)The velocity of the body is constant.
(b)The body is accelerating.
(c)The momentum of the body is zero.
(d)The momentum of the body is increasing
(e)The momentum of the body is decreasing
(a)
Impulse
400
The change in momentum of an object is equal
to the
(a)Force acting on it.
(b)Velocity change of the object.
(c)Impulse acting on it.
(d)Object’s mass times the force acting on it
(e)None of the above.
c
Impulse 500
Skelly the skater traveling at high speed needs a
certain amount of force to stop him. More stopping
force will be needed if he has
(a) more mass.
(b) More momentum.
(c ) less stopping distance.
(d) All of these.
d
Impulse 600
A well-hit golf ball has a change in momentum of 5
kg m/s. If the impact lasts 0.1 s, what is the
average force exerted on the ball by the club?
(a)500 N
(b)50 N
(c)5 N
(d)0.5 N
(e)0.05 N
b
Conservation 100
When a golf club hits a golf ball, the change in
momentum of the ball is _____ the change in
momentum of the club.
(a)Equal to
(b)Greater than
(c)Less than
(d)Either greater than or less than
(e)Dependent only in extraordinary circumstances
on
A
Conservation
200
Two ice skaters having the same masses and
speeds move toward each other on the ice,
collide, and stick together. After the collision
the velocity of the skaters is
(a)Twice the original velocity
(b)The same as the original velocity
(c)One-half the original velocity
(d)zero
d
Conservation
300
If an object moving at a rate of 20 m/s collides with
a stationary object and the two objects move
away together, the velocity of the combined
objects will be
(a)Greater than 20 m/s
(b)Less than 20 m/s
(c)20 m/s
(d)zero
b
Conservation
400
An elastic collision is best shown when
(a)Two pool balls collide and bounce away from
each other;
(b)When train cars collide and move away
together;
(c)When football players collide and land in a heap
together;
(d)You catch a ball when you’re on a skateboard;
(e)None of the above are elastic collisions
A
Conservation
500
Why does a gun kick when fired?
(a)Because momentum is conserved
(b)Because the bullet pushes harder on the gun
than the gun against the bullet
(c)Because of the added force of your finger on the
trigger
(d)Because the bullet is traveling at close to the
speed of sound
(e)None of the above are true or apply in this case.
A
Conservation 600
Auto companies frequently test the safety of
automobiles by putting them through crash tests to
observe the integrity of the passenger compartment.
If a 1000-kg car is sent toward a cement wall with a
speed of 14 m/s and the impact brings it to a stop in
0.08 s, with what average force is it brought to rest?
(a) 14 000 N
(b) 1120 N
(c) 71.43 N
(d) 175 000 N
(e) Not enough information provided.
D