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Newton's Second Law of Motion
MULTIPLE CHOICE. Choose the one alternative that best completes the statement
or answers the question.
A) a king-size pillow B) an automobile battery
C) neither - both have the
same
A) weight. B) force. C) mass. D) gravity. E) center of mass. 3) Compared
to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as
much A) inertia. B) mass. C) volume. D) all of these. E) none of these. 4) Compared
to a 1-kg block of solid iron, a 2-kg block of solid iron has the same
A) mass. B) volume. C) weight. D) all of these. E) none of these. 5) An
object maintains its state of motion because it has A) mass. B) weight. C) speed. D) acceleration. E) all of these.
6) Your
weight is A) actually your mass. B) the gravitational attraction
between you and the Earth. C) a property of mechanical
equilibrium. D) all of these. E) none of these.
7) One
object has twice as much mass as another object. The
first object also has twice as much A) inertia. B) velocity. C) gravitational acceleration.
D) volume. E) all of these.
8) Compared
to the mass of a certain object on Earth, the mass of the same object on
the moon is A) less. B) more. C) the same. 9) Strange
as it may seem, it is just as hard to accelerate a car on the A) the mass of the car is
independent of gravity. B) the weight of the car is
independent of gravity. C) ...Nonsense! A car is much
more easily accelerated on the moon than on the Earth. 10) An
empty roller-coaster car at an amusement park takes 3 minutes to make its
ride from start to finish. A) less than 3 minutes. B) more than 3 minutes. C) 3 minutes.
11) The
newton is a unit of A) force. B) mass. C) density. D) inertia.
12) In
which case would you have the largest mass of gold? If
your chunk of gold weighed 1 N on the A) moon. B) Earth. C) planet Jupiter.
13) An
object weighs 30 N on Earth. A second object weighs
30 N on the moon. Which has the greater mass? A) the one on Earth B) the one on the moon C) they have the same mass
D) not enough information to say 14) An
object's weight may properly be expressed in A) meters per second. B) kilograms. C) newtons. D) none of the above. 15) A
force is a vector quantity because it has both A) magnitude and direction.
B) mass and acceleration.
C) action and reaction counterparts.
16) A
10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity
on the 10-kg brick is A) the same as the force on
the 1-kg book. B) 10 times as much as the
force on the 1-kg book. C) zero. 17) An
object is propelled along a straight-line path by a force. A) quadruple. B) double. C) stay the same. D) halve. E) none of these. 18) If
an object's mass is decreasing while a constant force is applied to the
object, the acceleration A) decreases. B) increases. C) remains the same.
19) An
object is propelled along a straight-line path in space by a force. A) quadruples. B) doubles. C) stays the same. D) halves. E) none of these.
20) An
object is pulled northward with a force of 10 N and southward with a force
of 15 N. A) 0 N. B) 5 N. C) 10 N. D) 15 N. E) none of these.
21) The
force of friction on a sliding object is 10 newtons. A) more than 10 N. B) less than 10 N. C) 10 N. 22) A
10-N falling object encounters 4 N of air resistance. The net force on the
object is A) 0 N. B) 4 N. C) 6 N. D) 10 N. E) none of these. 23) A
10-N falling object encounters 10 N of air resistance. The net force on
the object is A) 0 N. B) 4 N. C) 6 N. D) 10 N. E) none of these.
24) An
apple weighs 1 N. When held at rest above your head,
the net force on the apple is A) 0 N. B) 0.1 N. C) 1 N. D) 9.8 N. E) none of these. 25) An
apple weighs 1 N. The net force on the apple when it is in free fall is
A) 0 N. B) 0.1 N. C) 1 N. D) 9.8 N. E) none of these. 26) Which
has zero acceleration? An object A) at rest. B) moving at constant velocity.
C) in mechanical equilibrium.
D) all of these. E) none of these.
27) Whenever
the net force on an object is zero, its acceleration A) may be zero. B) is zero.
28) The
maximum acceleration of a car while towing a second car twice its mass,
compared to no towing, is A) one half. B) one third. C) one fourth. D) the same. E) none of these.
A) momentarily regain its
higher initial speed. B) continue moving at 40 km/h
in the absence of forces. C) decrease in speed whether
or not other forces act.
30) A
heavy block at rest is suspended by a vertical rope. A) increases. B) decreases. C) remains the same.
31) A
1-kg mass at the earth's surface weighs A) 1 N. B) 4.9 N. C) 9.8 N. D) 10.8 N. E) none of these.
32) If
a non-rotating object has no acceleration, then we can say for certain
that it is A) at rest. B) moving at constant non-zero
velocity. C) in mechanical equilibrium.
D) all of these. E) none of these.
33) When
you stand at rest on a pair of bathroom scales, the readings on the scales
will always A) each be half your weight.
B) each equal your weight.
C) add to equal your weight.
34) Hang
from a pair of gym rings and the upward support forces of the rings will
always A) each be half your weight.
B) each be equal to your weight.
C) add up to equal your weight.
35) A
car has a mass of 1000 kg and accelerates at 2 meters per second per second. A) 500 N B) 1000 N C) 1500 N D) 2000 N E) none of these 36) A
tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters
per second per second. A) 500 kg B) 1000 kg C) 1500 kg D) 3000 kg E) none of these
37) A
girl pulls on a 10-kg wagon with a constant horizontal force of 30 N. A) 0.3 B)
3.0 C) 10 D) 30
E) 300 38) If
the mass of an object does not change, a constant net force on the object
produces constant A) velocity. B) acceleration. C) both of these
D) none of these.
39) A
force of 1 N accelerates a mass of 1 kg at the rate of 1 m/s2. A) half as much. B) twice as much. C) the same. D) none of these.
A) 1 N. B) 10 N. C) 100 N. D) 1000 N. E) more than 1000 N.
41) The
mass of a pet turtle that weighs 10 N is about A) 1 kg. B) 10 kg. C) 100 kg. D) 1000 kg. E) none of these.
42) The
force required to maintain an object at a constant velocity in free space
is equal to A) zero. B) the mass of the object.
C) the weight of the object.
D) the force required to stop
it. E) none of these.
43) An
object following a straight-line path at constant speed A) has a net force acting
upon it in the direction of motion. B) has zero acceleration.
C) must be moving in a vacuum
or in the absence of air drag. D) has no forces acting on
it. E) none of these.
44) A
man weighing 800 N stands at rest on two bathroom scales so that his weight
is distributed A) 200 N. B) 400 N. C) 800 N. D) 1600 N. E) none of these. 45) Neglecting
friction, a large block of ice and a small block of ice start sliding down
an incline together. A) before the light block.
B) after the light block.
C) at the same time as the
light block. 46) When
a woman stands at rest with two feet on a scale, the scale reads 500 N.
When she gently lifts one foot, A) less than 500 N. B) more than 500 N. C) 500 N. 47) A
push on a 1-kg brick accelerates the brick. Neglecting friction, to equally
accelerate a 10-kg brick, A) just as much force. B) 10 times as much force.
C) 100 times as much force.
D) one tenth the amount of
force. E) none of these.
48) A
10-N block and a 1-N block lie on a horizontal frictionless table. To push them with equal acceleration, A) equal forces on each block.
B) 10 times as much force
on the heavier block. C) 10 squared or 100 times
as much force on the heavier block. D) 1/10 as much force on the
heavier block. E) none of these.
49) A
rocket becomes progressively easier to accelerate as it travels upward
from the ground mainly because A) gravity becomes weaker
with increased distance. B) the applied force on the
rocket increases as burning of fuel progresses. C) the mass of the rocket
decreases as fuel is burned.
50) A
rock is thrown vertically into the air. At the very
top of its trajectory the net force on it is A) less than its weight. B) more than its weight. C) its weight.
51) A
rock is thrown vertically into the air. At the top
of its path, A) zero. B) 9.8. C) between 0 and 9.8. D) greater than 9.8. E) none of these. 52) A
block is dragged without acceleration in a straight-line path across a
level surface by a force of 6 N. A) less than 6 N B) more than 6 N C) 6 N D)
need more information to say 53) Suppose
a particle is being accelerated through space by a 10-N force. Suddenly
the particle A) is brought to a rapid halt.
B) decelerates gradually to
a halt. C) continues at the speed
it had when it encountered the second force. D) theoretically tends to
accelerate toward the speed of light. E) none of these. 54) A
jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines
is 50,000 N. A) 0.25 B) 1 C) 2 D) 4 E) none of these
55) A
1-kg rock that weighs 9.8 N is thrown straight upward at 20 m/s. Neglecting
air resistance, A) less than 9.8 N. B) 9.8 N. C) more than 9.8 N.
56) A
1-kg ball is thrown at 10 m/s straight upward. Neglecting
air resistance, the net force that acts A) 1/2 N. B) 1 N. C) 5 N. D) 7.5 N. E) 10 N. 57) The
brakes of a speeding truck are slammed on and it skids to a stop. A) 1/2 as far. B) 1 1/2 times as far. C) 2 times as far. D) 4 times as far. E) the same.
58) A
skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration
of about A) 0.2 g. B) 0.3 g. C) 0.4 g. D) 0.5 g. E) more than 0.5 g. 59) An
object released from rest on another planet requires one second to fall
a distance of 6 meters. A) 3 B) 6 C) 12 D) 15 E) none of these 60) A
car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits
a tree. A) 110 B) 220 C) 800 D) 880 E) ...can't be solved without
the mass of the car.
61) A
10-kilogram block with an initial velocity of 10 m/s slides 10 meters across
a horizontal surface A) 5 N. B) 10 N. C) 25 N. D) 50 N. E) none of these. 62) A
10-kilogram block is pushed across a horizontal surface with a horizontal
force of 20 N against A) 1. B) 2. C) 5. D) 10. E) none of these. 63) If
you are driving at 20 m/s and slam on your brakes and skid at 0.5 g to a
full stop, A) 3. B) 4. C) 5. D) 6. E) more than 6. 64) A
1000-kg automobile enters a freeway on-ramp at 20 m/s and accelerates uniformly
up to 40 m/s in a time of 10 seconds. How far does
the automobile travel during that time? A) 100 m B) 200 m C) 300 m D) 400 m E) none of these 65) A
2000-kg car experiences a braking force of 10,000 N and skids to a stop
in 6 seconds. A) 1.2 m/s. B) 15 m/s. C) 30 m/s. D) 45 m/s. E) none of these.
66) An
astronaut on another planet drops a 1-kg rock from rest and finds that
it falls a vertical A) 1 N. B)
2 N. C) 3 N. D) 4
N. E) 5 N. 67) What
horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across
a factory floor A) 600 N B) 1600 N C) 2000 N D) 2400 N E) none of these
68) The
human body can, under certain conditions, withstand an acceleration of 10
g. What net A) About 500 N. B) About 2500 N. C) About 5000 N. D) About 25,000 N. E) none of these. 69) If
an object of constant mass experiences a constant net force, it will have
a constant A) velocity. B) speed. C) acceleration. D) position. E) more than one of the above.
70) If
more horizontal force is applied to a sliding object than is needed to
maintain a constant velocity, A) the object accelerates
in the direction of the applied force. B) the object accelerates
opposite the direction of the applied force. C) the friction force increases.
D) two of the above. E) none of the above.
71) If
less horizontal force is applied to a sliding object than is needed to
maintain a constant velocity, A) the object accelerates
in the direction of the applied force. B) the friction force increases.
C) the object eventually slides
to a stop. D) none of the above.
72) Two
factors that greatly affect air resistance on falling objects are the A) size and mass of the object.
B) size and weight of the
object. C) size and speed of the object.
73) When
a falling object has reached its terminal velocity, its acceleration is
A) constant. B) zero. C) g. 74) Two
objects of the same size, but unequal weights are dropped from a tall tower. A) lighter object. B) heavier object. C) both hit at the same time.
D) not enough information.
75) A
light woman and a heavy man jump from an airplane at the same time and
open their A) the light woman B) the heavy man C) both should at the same
time D) not enough information 76) A
large and a small person wish to parachute at equal terminal velocities. A) get a larger parachute.
B) jump lightly. C) pull upward on the supporting
strands to decrease the downward net force. D) jump first from the plane.
E) none of these. 77) A
skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. A) 90 N. B) 250 N. C) 410 N. D) 500 N. E) none of these. 78) A
sack of potatoes weighing 200 N falls from an airplane.
As the velocity of fall increases, air resistance also increases.
When air resistance equals 200 N, the sack's acceleration in meters per
second per second is A) 0. |