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WorksheetsPhysics Semester 1 Review 2
Total questions: 70
Worksheet time: 1hrs 8mins
Name
Class
Date
1.
The units for momentum are
a)
kg
b)
m/s
c)
kg-m/s
d)
kg/m/s
2.
The difference between a car hitting a wall vs. a car hitting a hay stack is
a)
the Impulse on the car hitting the wall is greater
b)
the change in momentum of the car hitting the wall is greater
c)
the force on the car hitting the hay stack is greater
d)
the collision time of the car hitting the hay stack is greater
3.
Which object listed below has the greatest momentum?
a)
A 0.05 kg object rolling at 0.2 m/s.
b)
A 0.15 kg object rolling at 2 m/s.
c)
A 0.15 kg object rolling at 1 m/s
d)
A 0.4 kg object rolling at 2 m/s.
4.
The definition of momentum is
a)
Mass in Motion
b)
The size of an object
c)
The velocity of an object
d)
A comparison between two objects
5.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
6.
A 2 kg cart has a momentum of 16 kg m/s. What is its velocity?
a)
8 m/s
b)
32 m/s
c)
0.125 m/s
d)
18 m/s
7.
Which takes more force to catch, a bowling ball or a ping pong ball?
a)
bowling ball because it has more momentum
b)
ping pong ball because it has more momentum
c)
both require the same amount of force when catching
d)
bowling ball because it has less momentum
8.
The law of conservation of momentum states that,
a)
p before is less than p after
b)
p before is the same as p after
c)
p before is more than p after
9.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
10.
Why should you follow through when playing tennis?
a)
To increase the amount of force applied
b)
To increase the amount of time the force is applied
c)
To keep the impulse constant
d)
To minimize the change in velocity
11.
A 10kg toy truck moves at 5m/s East. It collides and bounces off of a 5kg toy car moving 10 m/s moving west. Which equation would you use to solve for the final velocity of the car?
a)
m1v1i+m2v2i=m1v1f+m2v2f
b)
(m1+m2)vi=m1v1f+m2v2f
c)
m1v1i+m2v2i=(m1+m2)vf
12.
Identical cell phones are dropped onto two different surfaces. One phone takes 1 second to stop. Another phone takes 2 seconds to stop. What happens to the force for the 2 second stop?
a)
Force is 1/2 as big
b)
Force doubles
c)
Force stays the same
d)
Force is 1/4 as big
13.
The purpose of air bags on a car is to
a)
decrease time of impact.
b)
increase force of impact.
c)
increase the time of impact.
d)
decrease the impulse during impact.
14.
A cannon fires a cannonball. Which object experiences more impulse?
a)
Cannon
b)
Cannonball
c)
Neither they both experience the same impulse
15.
A big fish swims upon and swallows a small fish at rest. After lunch, the big fish has less
a)
momentum
b)
velocity
c)
mass
16.
The purpose of crumble zones on a car is to
a)
decrease time of impact.
b)
increase force of impact.
c)
increase the time of impact.
d)
decrease the impulse during impact.
17.
An egg is thrown at a wall and at a bed sheet. The egg's change in velocity will be
a)
Greater for the wall collision
b)
Greater for the sheet collision
c)
Change in velocity is equal
18.
An egg is thrown at a wall and at a bed sheet. The force of impact will be
a)
Greater against the wall
b)
Greater against the sheet
c)
Force is equal
19.
Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
a)
the inside horse
b)
the outside horse
c)
Neither
20.
Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
a)
The inside horse
b)
The outside horse
c)
Neither - they both have the same angular speed
21.
A tin can whirled on the end of a string moves in a circle because
a)
the can continually pulls on the string.
b)
once the can starts moving, that is its natural tendency.
c)
there is a force on the can pulling it outward.
d)
there is an inward force acting on the can.
22.
"Centrifugal forces" are an apparent reality to observers in a reference frame that is
a)
rotating.
b)
an inertial reference frame.
c)
moving at constant velocity.
d)
at rest.
23.
A bug on a turning phonograph record will make more turns per minute if it is located toward the center of the record.
a)
True
b)
False
24.
As the rotational speed of a space habitat increases, the weight of people inside
a)
decreases
b)
increases
c)
stays the same
25.
A person weighs less at the equator than at the poles. The reason for this has to do with the
a)
tidal bulges.
b)
influence of the sun, moon, and all the planets.
c)
higher temperature at the equator, and expansion of matter.
d)
spin of the Earth.
26.
Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
a)
the inside horse
b)
the outside horse
c)
Neither
27.
Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
a)
The inside horse
b)
The outside horse
c)
Neither - they both have the same angular speed
28.
Which of the following is NOT a unit of rotational speed?
a)
Meters per second
b)
Revolutions per minute
c)
Revolutions per second
d)
Rotations per second
29.
What is the direction of the force that acts on clothes in the spin cycle of a washing machine?
a)
Inward
b)
Down
c)
Outward
d)
Up
30.
A tin can whirled on the end of a string moves in a circle because
a)
the can continually pulls on the string.
b)
once the can starts moving, that is its natural tendency.
c)
there is a force on the can pulling it outward.
d)
there is an inward force acting on the can.
31.
If you whirl a tin can on the end of a string and the string suddenly breaks, the can will
a)
fly directly away from you.
b)
fly off, tangent to its circular path.
c)
fly directly toward you.
d)
spiral away from your hand.
32.
A ladybug rests on the bottom of a tin can that is being whirled horizontally on the end of a string. Since the ladybug, like the can, moves in a circle, there must be a force on it. What exerts this force?
a)
Gravity
b)
The string
c)
Your hand
d)
The can
33.
"Centrifugal forces" are an apparent reality to observers in a reference frame that is
a)
rotating.
b)
an inertial reference frame.
c)
moving at constant velocity.
d)
at rest.
34.
A person weighs less at the equator than at the poles. The reason for this has to do with the
a)
tidal bulges.
b)
influence of the sun, moon, and all the planets.
c)
higher temperature at the equator, and expansion of matter.
d)
spin of the Earth.
35.
As the rotational speed of a space habitat increases, the weight of people inside
a)
decreases
b)
increases
c)
stays the same
36.
A car travels in a circle with constant speed. The net force on the car
a)
is zero because the car is not accelerating.
b)
is directed forward, in the direction of travel.
c)
is directed toward the center of the curve.
37.
If Earth rotated more slowly about its axis, your weight would
a)
decrease
b)
increase
c)
stay the same
38.
When a railroad train rounds a banked track, the centripetal force needed comes not from friction, but from the
a)
vertical component of the normal force.
b)
horizontal component of the normal force.
c)
normal force.
39.
The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is
a)
Friction
b)
his weight
c)
the normal force
d)
none of the above
40.
Stunt motorcyclist Biker Bob rides his bike inside a futuristic rotating space station-a giant rotating donut-shaped structure in space. The normal support force feels like weight to him. As he rides his bike in the same direction that the station rotates, the normal force
a)
remains unaffected
b)
increases
c)
decreases
41.
Where is the center of gravity of a softball bat located?
a)
Exactly halfway along the bat
b)
In the thin handle
c)
In the more massive end of the bat
42.
An object will fall over if its center of gravity is
a)
outside the object.
b)
too low.
c)
not over its area of support
d)
too high.
43.
When you carry a heavy load with one arm, why do you tend to hold your free arm away from your body?
a)
To change the mass of your body
b)
To be ready to grab something in case you fall
c)
To look good
d)
To change the center of gravity of your body and the load
44.
Because the sun has several planets orbiting it, it actually wobbles as it moves through space.
a)
True
b)
False
45.
The center of mass of an object is always located at the object's geometric center.
a)
True
b)
False
46.
Torque is the product of a force exerted on an object times the lever arm.
a)
True
b)
False
47.
In order for a seesaw to be in rotational equilibrium, the sum of the torques acting on it need not be balanced if one person sits closer to the fulcrum than the other person.
a)
True
b)
False
48.
Rotational inertia is the resistance an object has to changes in its rotational state.
a)
True
b)
False
49.
A spinning wheel will maintain its state of angular momentum unless acted on by an external torque.
a)
True
b)
False
50.
Ice skaters can increase their spin rate by using the conservation of angular momentum.
a)
True
b)
False
51.
A bug on a turning phonograph record will make more turns per minute if it is located toward the center of the record.
a)
True
b)
False
52.
When an object turns about an external axis, the motion is called rotation.
a)
True
b)
False
53.
The center of mass of an object is always located at the object's geometric center.
a)
True
b)
False
54.
Because the sun has several planets orbiting it, it actually wobbles as it moves through space.
a)
True
b)
False
55.
Does a bridge anchored resting on two pillars have any torque?
a)
No, it isn't moving
b)
Yes, but it is at equilibrium
c)
Yes, but it will soon break because of the torque
d)
No, Bridges can't have torque
56.
What force does not cause any torque?
a)
Force perpendicular to the fulcrum, and not on the fulcrum
b)
Force horizontal to the fulcrum, and not on the fulcrum
c)
Force perpendicular to the fulcrum, and slightly off center of the fulcrum
d)
Forces at a 45 degree angle to the fulcrum, and not on the fulcrum
57.
A seesaw with mass x is perfectly balanced with a fulcrum in the center. If mass x changes uniformly does the net torque change?
a)
Yes, because the Gravitational force increases with more mass, and torque is related to Force
b)
No, because the net torque is still zero despite increases in one of the individual components.
c)
No, because it is balanced that means net torque is zero, a uniform increase in weight keeps it balanced keeping net torque at zero
d)
Yes, any increase in weight will increase torque
58.
The center of mass is:
a)
the exact middle
b)
the heaviest part
c)
the point at which you can balance with one finger
d)
the idea that mass is concentrated throughout
59.
How do you get the maximum torque?
a)
longer lever arm and more force at an acute angle
b)
shorter lever arm with more force perpendicularly
c)
shorter lever arm and more force perpendicularly
d)
longer lever arm with more force perpendicularly
60.
The moment of inertia:
a)
is synonymous with mass
b)
does not depend on where the mass is located
c)
resistance to a change in rotational inertia
d)
more resistance to change = less inertia
61.
In the diagram above, two masses, one with mass m, the other with mass M = 2m are resting on a uniform plank of length L that pivots at its midpoint. If the mass m is at the far end of the plank, how far away from the pivot should the mass M be to balance the plank in a horizontal position shown?
a)
L/2
b)
L/3
c)
L/4
d)
L/6
62.
When an object is experiencing a net torque
a)
it is in dynamic equilibrium.
b)
it is in static equilibrium.
c)
it is rotating.
d)
it is translating.
63.
The property of a body to resist change in motion.
a)
mass
b)
weight
c)
volume
d)
inertia
64.
When the speed of an object is doubled, its momentum
a)
remains unchanged in accord with the conservation of momentum.
b)
doubles
c)
quadruples
d)
decreases
65.
A 2 kg cart has a momentum of 16 kg m/s. What is its velocity?
a)
8 m/s
b)
32 m/s
c)
0.125 m/s
d)
18 m/s
66.
The units for Impulse are
a)
N/s
b)
N-s
c)
N
d)
m/s
67.
An egg is thrown at a wall and at a bed sheet. The force of impact will be
a)
Greater against the wall
b)
Greater against the sheet
c)
Force is equal
68.
An egg is thrown at a wall and at a bed sheet. The egg's change in velocity will be
a)
Greater for the wall collision
b)
Greater for the sheet collision
c)
Change in velocity is equal
69.
Christmas is in the winter because ...
a)
Christ was born in the winter
b)
It was meant to overshadow a pagan holiday
c)
they flipped a coin
70.
What country began the origin of Santa Clause (Saint Nicholas)
a)
Hungary
b)
Rome
c)
Turkey
d)
Romania
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