1d forces concepts
Name:
1.
2.
Date:
An object near the surface of planet X falls freely
from rest and reaches a speed of 12.0 meters per
second after it has fallen 14.4 meters. What is the
acceleration due to gravity on planet X ?
A.
2.50 m/s2
B.
C.
9.80 m/s2
D. 10.0 m/s2
5.
The diagram shows a student applying a 10-newton
force to slide a piece of wood at constant speed
across a horizontal surface. After the wood is cut
in half, one piece is placed on top of the other, as
shown.
5.00 m/s2
What is the magnitude of the force, F, required to
slide the stacked wood at constant speed across
the surface?
A book weighing 20. newtons slides at constant
velocity down a ramp inclined 30. to the
horizontal as shown in the accompanying diagram.
A.
6.
40 N
B.
20 N
C.
10 N
D. 5.0 N
The accompanying diagram shows a child pulling
a 50.-kilogram friend on a sled by applying a
300.-newton force on the sled rope at an angle of
40. with the horizontal.
What is the force of friction between the book and
the ramp?
A.
10. N up the ramp
B.
17 N up the ramp
C.
10. N down the ramp
The vertical component of the 300.-newton force
is approximately
D. 17 N down the ramp
3.
4.
A.
Which combination of three concurrent forces
acting on a body could not produce equilibrium?
A.
1 N, 3 N, 5 N
B.
2 N, 2 N, 2 N
C.
3 N, 4 N, 5 N
D. 4 N, 4 N, 5 N
If a 30-newton force is required to accelerate a
2-kilogram object at 10 meters per second2 , over
a level oor, then the magnitude of the frictional
force acting on the object is
A.
0N
B.
10 N
C.
20 N
D. 30 N
page 1
510 N
B.
230 N
C.
190 N
D. 32 N
7.
A 6-newton force and an 8-newton force act
concurrently on a box located on a frictionless
horizontal surface. Which top-view diagram shows
the forces producing the smallest magnitude of
accleration of the box?
10.
The accompanying diagram shows a block on a
horizontal frictionless surface. A 100.-newton
force acts on the block at an angle of 30. above
the horizontal.
A.
What is the magnitude of force F if it establishes
equilibrium?
B.
C.
11.
D.
8.
9.
Equilibrium exists in a system where three forces
are acting concurrently on an object. If the system
includes a 5.0-newton force due north and a
2.0-newton force due south, the third force must be
A.
7.0 N south
B.
C.
3.0 N south
D. 3.0 N north
12.
7.0 N north
A 2,400-kilogram car is traveling at a speed
of 20. meters per second. Compared to the
magnitude of the force required to stop the car in
12 seconds, the magnitude of the force required to
stop the car in 6.0 seconds is
A.
half as great
B.
C.
the same
D. four times as great
A.
50.0 N
B.
86.6 N
C.
100. N
D. 187 N
A 5-newton force directed east and a 5-newton
force directed north act concurrently on a point.
The resultant of the two forces is
A.
5 N northeast
B.
10. N southwest
C.
7 N northeast
D. 7 N southwest
Into how many possible components can a single
force be resolved?
A.
an unlimited number
B.
two components
C.
three components
D. four components at right angles to each other
13.
twice as great
page 2
A wooden block is at rest on a horizontal steel
surface. If a 10.-newton force applied parallel to
the surface is required to set the block in motion,
how much force is required to keep the block
moving at constant velocity?
A.
less than 10. N
C.
10. N
B.
greater than 10. N
1d forces concepts
14.
15.
A 50.-newton horizontal force is needed to keep
an object weighing 500. newtons moving at a
constant velocity of 2.0 meters per second across a
horizontal surface. The magnitude of the frictional
force acting on the object is
A.
500. N
B.
C.
50. N
D. 0 N
18.
The accompanying diagram shows a granite block
being slid at constant speed across a horizontal
concrete oor by a force parallel to the oor.
450. N
Which pair of quantities could be used to
determine the coe cient of friction for the granite
on the concrete?
A di erent force is applied to each of four
1-kilogram blocks to slide them across a uniform
steel surface at constant speed as shown below.
In which diagram is the coe cient of friction
between the block and steel smallest?
A.
A.
mass and speed of the block
B.
mass and normal force on the block
C.
frictional force and speed of the block
D. frictional force and normal force on the block
B.
19.
C.
D.
16.
17.
smaller
B.
larger
C.
20.
the same
The magnitude of the force that a baseball bat
exerts on a ball is 50. newtons. The magnitude of
the force that the ball exerts on the bat is
A.
5.0 N
B.
10. N
C.
50. N
A.
a satellite moving at constant speed around
Earth in a circular orbit
B.
an automobile braking to a stop
C.
a bicycle moving at constant speed on a
straight, level road
D. a pitched baseball being hit by a bat
A mosquito ying over a highway strikes the
windshield of a moving truck. Compared to
the magnitude of the force of the truck on the
mosquito during the collision, the magnitude of
the force of the mosquito on the truck is
A.
In which situation is the net force on the object
equal to zero?
21.
D. 250 N
A 1,200-kilogram car traveling at 10. meters
per second hits a tree and is brought to rest in
0.10 second. What is the magnitude of the average
force acting on the car to bring it to rest?
A.
1:2
102 N
B.
1:2
103 N
C.
1:2
104 N
D. 1:2
105 N
A spring scale reads 20. newtons as it pulls a
5.0-kilogram mass across a table. What is the
magnitude of the force exerted by the mass on the
spring scale?
A.
page 3
49 N
B.
20. N
C.
5.0 N
D. 4.0 N
1d forces concepts
22.
A 60-kilogram skydiver is falling at a constant
speed near the surface of Earth. The magnitude of
the force of air friction acting on the skydiver is
approximately
A.
23.
0N
B.
6N
C.
60 N
27.
D. 600 N
When a 12-newton horizontal force is applied to a
box on a horizontal tabletop, the box remains at
rest. The force of static friction acting on the box
is
A.
0N
B.
between 0 N and 12 N
C.
12 N
25.
28.
A box is pushed toward the right across a
classroom oor. The force of friction on the box
is directed toward the
A.
left
B.
right
C.
ceiling
D.
oor
26.
1.0 N
B.
5.0 N
C.
is greater than the force of static friction
B.
is less than the force of static friction
C.
increases as the speed of the object relative to
the surface increases
25 N
Two carts are pushed apart by an expanding
spring, as shown in the diagram below.
If the average force on the 1-kilogram cart is
1 newton, what is the average force on the
2-kilogram cart?
A.
29.
A 40.-kilogram mass is moving across a horizontal
surface at 5.0 meters per second. What is the
magnitude of the net force required to bring the
mass to a stop in 8.0 seconds?
A.
A.
D. decreases as the speed of the object relative
to the surface increases
D. greater than 12 N
24.
The force required to start an object sliding across
a uniform horizontal surface is larger than the
force required to keep the object sliding at a
constant velocity. The magnitudes of the required
forces are di erent in these situations because the
force of kinetic friction
1N
B.
0.0 N
C.
0.5 N
D. 4 N
The diagram below shows a 5.00-kilogram block
at rest on a horizontal, frictionless table.
D. 40. N
A 0.2-kilogram red ball is thrown horizontally at
a speed of 4 meters per second from a height of
3 meters. A 0.4-kilogram green ball is thrown
horizontally from the same height at a speed of
8 meters per second. Compared to the time it
takes the red ball to reach the ground, the time it
takes the green ball to reach the ground is
A.
one-half as great
B.
C.
the same
D. four times as great
Which diagram best represents the force exerted
on the block by the table?
A.
B.
C.
D.
twice as great
page 4
1d forces concepts
30.
The diagram below represents a block at rest on
an incline.
32.
A carpenter hits a nail with a hammer. Compared
to the magnitude of the force the hammer exerts
on the nail, the magnitude of the force the nail
exerts on the hammer during contact is
A.
33.
Which diagram best represents the forces acting on
the block? (italFf = frictional force, FN = normal
force, and Fw = weight.)
A.
less
B.
greater
C.
A student is standing in an elevator that is
accelerating downward. The force that the student
exerts on the oor of the elevator must be
A.
less than the weight of the student when at
rest
B.
greater than the weight of the student when
at rest
C.
less than the force of the oor on the student
D. greater than the force of the
student
B.
34.
the same
oor on the
As shown in the diagram below, an open box
and its contents have a combined mass of
5.0 kilograms. A horizontal force of 15 newtons
is required to push the box at a constant speed of
1.5 meters per second across a level surface.
C.
The inertia of the box and its contents increases if
there is an increase in the
D.
31.
kg m
s2
B.
kg m
s
C.
kg m2
s2
D.
kg2 m2
s2
speed of the box
B.
mass of the contents of the box
C.
magnitude of the horizontal force applied to
the box
D. coe cient of kinetic friction between the box
and the level surface
A force of 1 newton is equivalent to 1
A.
A.
page 5
1d forces concepts
35.
Which situation describes an object that has no
unbalanced force acting on it?
A.
an apple in free fall
B.
a satellite orbiting Earth
C.
a hockey puck moving at constant velocity
acrcoss ice
38.
39.
D. a laboratory cart moving down a frictionless
30. incline
36.
An 8.0-newton block is accelerating down a
frictionless ramp inclined at 15 to the horizontal,
as shown in the diagram below.
What is the magnitude of the gravitational force
between two 5.0-kilogram masses separated by a
distance of 5.0 meters?
A.
5:0
100 N
C.
6:7
10
11 N
3:3
10
10 N
D. 1:3
10
11 N
B.
A man is pushing a baby stroller. Compared to
the magnitude of the force exerted on the stroller
by the man, the magnitude of the force exerted on
the man by the stroller is
A.
zero
B.
smaller, but greater than zero
C.
larger
D. the same
What is the magnitude of the net force causing
the block's acceleration?
A.
37.
0N
B.
2.1 N
C.
7.7 N
D. 8.0 N
Four forces act concurrently on a block on a
horizontal surface as shown in the diagram below.
As a result of these forces, the block
A.
moves at constant speed to the right
B.
moves at constant speed to the left
C.
accelerates to the right
D. accelerates to the left
page 6
1d forces concepts
40.
A 100.0-kilogram boy and a 50.0-kilogram girl, each holding a spring scale, pull against each other as shown in
the diagram below.
The graph below shows the relationship between the magnitude of the force that the boy applies on his spring scale
and time.
Which graph best represents the relationship between the magnitude of the force that the girl applies on her spring
scale and time?
A.
B.
C.
D.
page 7
1d forces concepts
41.
The diagram below shows a compressed spring
between two carts initially at rest on a horizontal,
frictionless surface. Cart A has a mass of
2 kilograms and cart B has a mass of 1 kilogram.
A string holds the carts together.
42.
Which situation represents a person in equilibrium?
A.
a child gaining speed while sliding down a
slide
B.
a woman accelerating upward in an elevator
C.
a man standing still on a bathroom scale
D. a teenager driving around a corner in his car
The string is cut and the carts move apart.
Compared to the magnitude of the force the spring
exerts on cart A, the magnitude of the force the
spring exerts on cart B is
A.
the same
B.
half as great
C.
twice as great
D. four times as great
page 8
1d forces concepts
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1d forces concepts
1.
Answer:
B
2.
Answer:
A
3.
Answer:
A
4.
Answer:
B
5.
Answer:
C
6.
Answer:
C
7.
Answer:
D
8.
Answer:
C
9.
Answer:
B
10.
Answer:
B
11.
Answer:
C
12.
Answer:
A
13.
Answer:
A
14.
Answer:
C
15.
Answer:
B
16.
Answer:
C
17.
Answer:
C
18.
Answer:
D
19.
Answer:
C
20.
Answer:
D
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Answer:
B
D
C
A
C
C
B
A
A
D
A
C
A
B
C
B
D
C
D
A
A
C