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WorksheetsFinal_A_Review
Total questions: 103
Worksheet time: 3hrs 26mins
Name
Class
Date
1.
An arrow in a bow has 70 J of potential energy. Assuming no loss of energy to heat, how much kinetic energy will it have after it has been shot?
a)
0 J
b)
35 J
c)
50 J
d)
70 J
e)
140 J
2.
Energy is changed from one form to another with no net loss or gain.
a)
Sometimes true
b)
Always false
c)
Always true
3.
As a pendulum swings back and forth
a)
at the end points of its swing, its energy is all potential.
b)
at the lowest part of its swing, its energy is all kinetic.
c)
kinetic energy is transformed into potential energy.
d)
potential energy is transformed into kinetic energy.
e)
all of the above
4.
A ball is thrown into the air with 100 J of kinetic energy, which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is
a)
100 J.
b)
more than 100 J.
c)
less than 100 J.
d)
Not enough information given.
5.
A person on a roof throws one ball downward and an identical ball upward at the same speed. The ball thrown downward hits the ground with 140 J of kinetic energy. Ignoring air friction, with how much kinetic energy does the second ball hit the ground?
a)
less than 140 J
b)
140 J
c)
280 J
d)
more than 280 J
e)
none of the above
6.
A popular toy consists of an aligned row of identical elastic balls suspended by strings so they touch each other. When two balls on one end are elevated and released, they slam into the array of balls and two balls pop out the other side. If instead, one ball popped out with twice the speed, this would be a violation of the conservation of
a)
both energy and momentum.
b)
energy.
c)
momentum.
7.
All simple machines ideally work on the principle that
a)
impulse equals momentum change.
b)
force equals mass times acceleration.
c)
total momentum before a collision equals total momentum after the collision.
d)
work input equals work output.
e)
kinetic energy transforms into potential energy.
8.
The ratio of output force to input force of a simple machine is called the
a)
fulcrum.
b)
efficiency.
c)
pivot point.
d)
lever arm.
e)
mechanical advantage.
9.
A pulley system can
a)
change the direction of a force.
b)
multiply the force.
c)
increase the amount of work done.
d)
Both A and B
e)
Both B and C
10.
Sue can easily lift a 45.0-N rock with the help of a lever. When she pushes down with 20.0 N of force, she lifts the rock 0.3 meters. How far does she move her arms to do this?
a)
0.3 m
b)
0.7 m
c)
6.0 m
d)
2.3 m
e)
20.0 m
11.
A pulley has two supporting strands. In order for it to lift a load 1 meter, the person pulling will have to pull a distance of
a)
m/4
b)
m/2
c)
1 m.
d)
2 m.
e)
4 m.
12.
Potential energy is the energy an object has because of its
a)
density.
b)
size.
c)
location.
d)
speed.
e)
temperature.
13.
The amount of potential energy possessed by an elevated object is equal to
a)
the power used to lift it.
b)
the distance it is lifted.
c)
the force needed to lift it.
d)
the work done in lifting it.
e)
the value of the acceleration due to gravity.
14.
An object at rest may have
a)
energy
b)
speed
c)
velocity
d)
momentum
e)
noe of the above
15.
Kinetic energy of an object is equal to
a)
its mass multiplied by its acceleration squared.
b)
one half the product of its mass times its speed squared.
c)
its mass multiplied by its speed.
d)
one half the product of its mass times its speed.
e)
its mass multiplied by its acceleration.
16.
How much farther will a car traveling at 100 km/s skid than the same car traveling at 50 km/s?
a)
Half as far.
b)
The same distance.
c)
Twice as far.
d)
Four times as far.
e)
Five times as far.
17.
When a car’s speed triples, its kinetic energy
a)
remains the same.
b)
triples.
c)
increases by four times.
d)
increases by nine times.
e)
none of the above
18.
Rockets are launched from an airplane in the forward direction of motion. The kinetic energy of the airplane will be
a)
unchanged.
b)
increased.
c)
decreased.
19.
An object that has kinetic energy must be
a)
at rest.
b)
falling.
c)
moving.
d)
elevated.
20.
An object that has kinetic energy must have
a)
acceleration.
b)
a force applied to maintain it.
c)
momentum.
d)
none of the above
21.
Which has greater kinetic energy, a car traveling at 30 km/h or a half-as-massive car traveling at 60 km/h?
a)
The 60 km/h car
b)
Both have the same kinetic energy.
c)
The 30 km/h car
22.
If an object has kinetic energy, then it also must have
a)
impulse.
b)
force.
c)
momentum.
d)
acceleration.
e)
none of the above
23.
If the velocity of a moving object doubles, then what else doubles?
a)
acceleration.
b)
kinetic energy.
c)
momentum.
d)
all of the above
e)
none of the above
24.
A small economy car (low mass) and a limousine (high mass) are pushed from rest across a parking lot, equal distances with equal forces. The car that receives more kinetic energy is the
a)
the limousine.
b)
the small economy car.
c)
neither one—they receive the same amount of kinetic energy.
25.
Consider molecules of hydrogen gas and molecules of heavier oxygen gas that have the same kinetic energy. The molecules with the greater speed are
a)
hydrogen.
b)
Both have the same speed.
c)
oxygen.
26.
Suppose a moving car has 3000 J of kinetic energy. If the car's speed doubles, how much kinetic energy will it then have?
a)
1000 J
b)
1500 J
c)
3000 J
d)
6000 J
e)
12,000 J
27.
If Kelly the skater's speed increases so he has three times the momentum, then his kinetic energy increases by
a)
one third times.
b)
three times.
c)
nine times.
d)
none of the above (KE remains the same).
28.
A 60-N object moves at 1 m/s. Its kinetic energy is
a)
1 J.
b)
3 J.
c)
60 J.
d)
more than 60 J.
29.
Energy transforms from one form to another with no net loss or gain.
a)
true
b)
false
30.
The ratio of output force to input force for a simple machine is its efficiency.
a)
true
b)
false
31.
A pulley system can change only direction; it can't multiply forces as well.
a)
true
b)
false
32.
The energy an object has by virtue of its location is its potential energy.
a)
true
b)
false
33.
The energy an object has by virtue of its motion is its kinetic energy.
a)
true
b)
false
34.
In physics, work is defined as
a)
force times time.
b)
force divided by distance.
c)
distance divided by time.
d)
force divided by time.
e)
force times distance.
35.
If you lift two loads up one story, how much work do you do compared to lifting just one load up one story?
a)
One quarter as much
b)
One half as much
c)
The same amount
d)
Twice as much
e)
Four times as much
36.
If you lift one load up two stories, how much work do you do compared to lifting one load up only one story?
a)
One quarter as much
b)
One half as much
c)
The same amount
d)
Twice as much
e)
Four times as much
37.
If Nellie Newton pushes an object with twice the force for twice the distance, she does
a)
twice the work.
b)
the same work.
c)
four times the work.
d)
eight times the work.
38.
The unit of work is the
a)
watt.
b)
meter.
c)
joule.
d)
newton.
e)
second.
39.
Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a 35-kg sack vertically 4 meters?
a)
Lifting the 70 kg sack
b)
Lifting the 35 kg sack
c)
Both require the same amount of work.
40.
How many joules of work are done on a box when a force of 25 N pushes it 3 m?
a)
1 J
b)
3 J
c)
8 J
d)
25 J
e)
75 J
41.
How much work is done on a 60-N box of books that you carry horizontally across a 6-m room?
a)
0 J
b)
6 J
c)
10 J
d)
60 J
e)
360 J
42.
How much work is done on a 20-N crate that you lift 2 m?
a)
0 J
b)
1 J
c)
2 J
d)
20 J
e)
40 J
43.
It takes 80 J to push a large box 8 m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box?
a)
8 N
b)
10 N
c)
80 N
d)
640 N
e)
none of the above
44.
Power is defined as the
a)
force on an object divided by the time the force acts.
b)
work done times the time taken to do that work.
c)
work done on an object divided by the time taken to do the work.
d)
distance divided by the time taken to move that distance.
e)
force on an object times the distance the object moves.
45.
The unit of power is the
a)
newton.
b)
meter.
c)
joule.
d)
second.
e)
watt.
46.
A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amounts of
a)
energy.
b)
power.
c)
both A and B
d)
none of the above
47.
How much power is required to do 40 J of work on an object in 5 seconds?
a)
0 W
b)
5 W
c)
8 W
d)
40 W
e)
200 W
48.
How much power is expended if you lift a 60 N crate 10 meters in 1 second?
a)
0 W
b)
6 W
c)
10 W
d)
60 W
e)
600 W
49.
In physics, the amount of work done on an object is the product of the force exerted on the object times the time the object moves.
a)
true
b)
false
50.
The unit of work is called the joule.
a)
true
b)
false
51.
When we carry an object across a room, without lifting it or setting it down, we do no physical work on it.
a)
true
b)
false
52.
The rate at which work is done is called energy.
a)
true
b)
false
53.
The unit of power is the watt.
a)
true
b)
false
54.
The rate at which work is done is called power.
a)
true
b)
false
55.
More power is needed to carry a heavy suitcase slowly up a flight of stairs than to carry the suitcase quickly up the same flight of stairs.
a)
true
b)
false
56.
Density is defined as _____.
a)
length divided by volume
b)
length divided by time
c)
mass divided by volume
d)
mass times acceleration
e)
none of the above
57.
Which has more density, a bushel of apples or 10 bushels of apples?
a)
1 bushel
b)
10 bushels
c)
Both have the same density.
58.
Which has more density, a loaf of bread just after it comes out of the oven or the same loaf that has been squeezed into a small volume?
a)
The squeezed loaf
b)
The fresh loaf
c)
They both have the same density.
59.
The density of a steel rod is determined by the _____.
a)
mass of the rod
b)
length of the rod
c)
volume of the rod
d)
spacing between atoms in the rod
e)
all of the above
60.
When a solid block of material is cut in half, its density is _____.
a)
doubled
b)
halved
c)
unchanged
61.
Which has the greater density, a lake full of water or a cup full of lake water?
a)
The cup
b)
Both have the same density.
c)
The lake
62.
Compared to the density of a kilogram of feathers, the density of a kilogram of lead is _____.
a)
less
b)
more
c)
the same
63.
If the mass of an object were to double while its volume remained the same, its density would _____.
a)
double
b)
halve
c)
stay the same
64.
If the volume of an object were to double while its mass stayed the same, its density would _____.
a)
halve
b)
double
c)
stay the same
65.
A block of iron is heated in a furnace, where it consequently expands. In the expanded condition, its density is _____.
a)
more
b)
the same
c)
less
66.
A 1612-kg metal block has a density of 4979 kg per cubic meter and an approximate volume of _____.
a)
0.32 cubic meters
b)
3.09 cubic meters
c)
4.98 cubic meters
d)
1.61 cubic meters
e)
none of the above
67.
What is the density of a rock that has a mass of 350 g and a volume of 250 cubic centimeters?
a)
0.7 g/cubic cm
b)
1.4 g/cubic cm
c)
600 g/cubic cm
d)
3,500 g/cubic cm
e)
87,500 g/cubic cm
68.
A metal anchor has a density of 3000 kg per cubic meter and a volume of 6 cubic meters. What is the anchor's mass?
a)
250 kg
b)
500 kg
c)
3000 kg
d)
18,000 kg
e)
none of the above
69.
Which has the greater density, 5 kg of silver or 10 kg of steel?
a)
The steel
b)
The silver
c)
They both have the same density
70.
What is the weight density of a tub of water that weighs 2940 N and occupies a volume of 4 cubic meters?
a)
184 N/cubic m
b)
368 N/cubic m
c)
735 N/cubic m
d)
2,940 N/cubic m
e)
11,760 N/cubic m
71.
The weight density of an object is its mass divided by its weight.
a)
true
b)
false
72.
When you squeeze a loaf of bread, both its mass and its density decrease.
a)
true
b)
false
73.
Lead is the most dense metal, even more dense than gold and uranium.
a)
true
b)
false
74.
Pressure in a liquid depends on the _____.
a)
depth of the measuring point
b)
mass of the liquid
c)
volume of the liquid
d)
density of the liquid
e)
both A and D
75.
Where is the pressure greater, one meter beneath the surface of Lake Michigan or one meter beneath the surface of a swimming pond?
a)
In Lake Michigan
b)
The pressure is approximately the same in both places
c)
In the pond
76.
Water pressure on a submerged object is greatest against the _____.
a)
corners of the object
b)
bottom of the object
c)
sides of the object
d)
top of the object
e)
none of the above
77.
The pressure at the bottom of a jug filled with water does NOT depend on the _____.
a)
surface area of the water
b)
density of water
c)
depth of the liquid
d)
acceleration due to gravity
e)
none of the above
78.
Where is the buoyant force on a submerged rock greater, near the surface of the fluid or 10 m below the surface?
a)
Near the surface
b)
10 m below the surface
c)
Neither place—the buoyant force is independent of depth
79.
The buoyant force on an object is least when the object is _____.
a)
submerged near the bottom
b)
partly submerged
c)
submerged near the surface
d)
none of the above
80.
The reason a life jacket helps you float is that _____.
a)
the jacket repels water
b)
the jacket makes you weigh less
c)
the jacket has the same density as an average human
d)
you and the jacket together have density less than your density alone
81.
Lobsters live on the bottom of the ocean. The density of a lobster is _____.
a)
equal to the density of seawater
b)
greater than the density of seawater
c)
less than the density of seawater
82.
If an object has a density greater than the density of water, it will _____.
a)
sink
b)
neither float nor sink, but stay anywhere it is put
c)
float
83.
If an object has a density equal to the density of water, it will _____.
a)
neither float nor sink, but stay anywhere it is put
b)
sink
c)
float
84.
When first put in water, a plastic toy boat will sink until _____.
a)
it displaces a volume of water equal to its own volume
b)
the water density equals the density of the boat
c)
it displaces a weight of water equal to its own weight
d)
the buoyant force equals the volume of the boat
e)
the buoyant force equals the density of the boat
85.
Compared to an empty ship, the same ship loaded with plastic foam will float _____.
a)
at the same level in the water
b)
lower in the water
c)
higher in the water
86.
Two equal-sized buckets are filled to the top with water. One of the buckets has a piece of wood floating in it, making its total weight _____.
a)
more than the weight of the other bucket
b)
equal to the weight of the other bucket
c)
less than the weight of the other bucket
87.
A block of balsa wood floats on water while a block of lead the same size lies submerged in the water. The buoyant force is _____.
a)
greater on the lead
b)
greater on the wood
c)
the same for both
88.
A kilogram of lead and a kilogram of aluminum are submerged in water. The buoyant force is _____.
a)
greater on the aluminum
b)
greater on the lead
c)
the same for both
89.
A boat loaded with a barrel of water floats in a swimming pool. When the water in the barrel is poured overboard, the swimming pool level will _____.
a)
fall
b)
rise
c)
remain unchanged
90.
When a boat sails from fresh water to salt water, the boat will float _____.
a)
at the same level
b)
higher in the salt water
c)
lower in the salt water
91.
If a weighted, air-filled balloon sinks in a lake, it will _____.
a)
be buoyed up with constant force while sinking
b)
probably sink to the bottom and probably rise later
c)
sink until it reaches equilibrium and then remain at constant depth
d)
always sink to the bottom
e)
none of the above
92.
A floating ice cube contains a small piece of iron. After the ice cube melts, the water level will _____.
a)
fall
b)
rise
c)
remain unchanged
93.
An ice cube floating in a glass of water contains many air bubbles. When the ice melts, the water level will _____.
a)
remain unchanged
b)
rise
c)
fall
94.
There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived. Which of the following is most likely?
a)
The force on his finger would have been huge, but the pressure very small.
b)
This is impossible because of the large size of the Atlantic Ocean.
c)
The force on his finger would have been less than 1 N.
d)
Both the force and pressure on his finger would have been very large.
e)
none of the above
95.
When you float in salt water compared to floating in fresh water, the buoyant force that supports you is _____.
a)
the same
b)
greater
c)
less
96.
Pascal's principle says that changes in pressure at any point in an enclosed fluid _____.
a)
remain only at the point
b)
are transmitted to all points in the fluid
c)
quickly diminish from point to point in the fluid
d)
are transmitted only to points below it
e)
are transmitted only to points close to it
97.
A hydraulic arrangement consists of a water-filled U-tube that is wider on one end than on the other. Pistons are fitted in both ends. To multiply an input force, the input end should be the one having the _____.
a)
larger-diameter piston
b)
smaller-diameter piston
c)
It doesn't matter what relative size the piston is.
98.
In a hydraulic device, the output piston has 100 times the cross-section area as the input piston. This means the device will multiply force _____.
a)
1000 times
b)
100 times
c)
10 times
d)
none of the above
99.
A hydraulic press multiplies a force by 100. This multiplication is done at the expense of _____.
a)
the distance through which the force acts
b)
the time over which the force acts, which is extended by a factor of 100
c)
the mechanism providing the force
d)
energy, which decreases by a factor of 100
e)
none of the above
100.
In a hydraulic press operation, it is impossible for the _____.
a)
force output to exceed the force input
b)
output displacement to exceed the input displacement
c)
energy output to exceed the energy input
d)
none of the above
101.
The volume of water displaced by a floating 20,000-N boat _____.
a)
is the volume of the boat
b)
depends on the shape of the ship's hull
c)
is 20,000 cubic meters
d)
is the volume of 20,000 N of water
102.
Floating Freda, who can just barely float in fresh water, has a mass of 44 kg. Her volume is therefore about _____.
a)
22 liters
b)
44 liters
c)
220 liters
d)
none of the above
103.
A 40,000-N car is lifted on a hydraulic piston of area 1000 square centimeters. How much force on a 10 square-centimeter piston is needed to lift the car?
a)
40,000 N
b)
10,000 N
c)
8,000 N
d)
4,000 N
e)
400 N
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