Download 1.Which unit is equivalent to a newton per kilogram?

1. Which unit is equivalent to a newton per kilogram?
A) m
s2
B) W
6. Base your answer to the following question on The
diagram below shows a student throwing a baseball
horizontally at 25 meters per second from a cliff 45
meters above the level ground.
s
C) J•s
D) kg•m
s
2. Which object weighs approximately 1 Newton?
A) dime
C) physics student
B) paper clip
D) golf ball
3. A ball is thrown vertically upward with an initial
velocity of 29.4 meters per second. What is the
maximum height reached by the ball? [Neglect friction.]
A) 14.7 m
C) 44.1 m
B) 29.4 m
D) 88.1 m
4. A baseball dropped from the roof of a tall building takes
3.1 seconds to hit the ground. How tall is the building?
[Neglect friction.]
A) 15 m
B) 30. m C) 47 m
D) 94 m
5. Which pair of graphs represent the same motion?
A)
B)
C)
D)
Approximately how far from the base of the cliff does the
ball hit the ground? [Neglect air resistance.]
A) 45 m
B) 75 m
C) 140 m D) 230 m
7. A 0.50-kilogram object moves in a horizontal circular
path with a radius of 0.25 meter at a constant speed of
4.0 meters per second. What is the magnitude of the
object’s acceleration?
A) 8.0 m/s 2
C) 32 m/s 2
B) 16 m/s 2
D) 64 m/s 2
8. If the velocity of a car traveling around a circular track
doubles, its centripetal acceleration would be
A) 1/2 as great
C) 1/4 as great
B) 2 times greater
D) 4 times greater
9. A car rounds a horizontal curve of constant radius at a
constant speed. Which diagram best represents the
directions of both the car’s velocity, v, and acceleration, a?
A)
B)
15. 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) 49 N B) 20. N C) 5.0 N D) 4.0 N
16. A net force of 25 Newtons is applied horizontally to a
10.-kilogram block resting on a table. What is the
magnitude of the acceleration of the block?
C)
D)
10. Which body is in equilibrium?
A) a satellite orbiting Earth in a circular orbit
B) a ball falling freely toward the surface of Earth
C) a car moving with a constant speed along a
straight, level road
D) a projectile at the highest point in its trajectory
A) 0.0 m/s 2
C) 0.40 m/s 2
B) 0.26 m/s 2
D) 2.5 m/s 2
17. A student pulls a 60.-newton sled with a force
having a magnitude of 20. newtons. What is the
magnitude of the force that the sled exerts on the
student?
A) 20. N B) 40. N C) 60. N D) 80. N
18. Base your answer to the following question on The
diagram below shows a horizontal 8.0-newton force
applied to a 4.0-kilogram block on a frictionless table.
11. A 0.50-kilogram cart is rolling at a speed of 0.40 meter
per second. If the speed of the cart is doubled, the
inertia of the cart is
A) halved
C) quadrupled
B) doubled
D) unchanged
12. Which object has the greatest inertia?
A)
B)
C)
D)
a falling leaf
a softball in flight
a seated high school student
a rising helium-filled toy balloon.
13. A 25-newton horizontal force northward and a
35-newton horizontal force southward act concurrently
on a 15-kilogram object on a frictionless surface. What
is the magnitude of the object’s acceleration?
A) 0.67 m/s 2
C) 2.3 rn/s 2
B) 1.7 m/s 2
D) 4.0 m/s 2
14. A 60-kilogram student jumps down from a laboratory
counter. At the instant he lands on the floor, his speed
is 3 meters per second. If the student stops in 0.2
seconds, what is the average force on the student?
A) 1 × 10 –2 N
C) 9 × 10 2 N
B) 1 × 10 2 N
D) 4 N
What is the magnitude of the block’s acceleration?
A) 0.50 m/s 2
C) 9.8 m/s 2
B) 2.0 m/s 2
D) 32 m/s 2
19. An unbalanced force is applied to a mass, producing an
acceleration. If the same unbalanced force is applied to
a mass one-half as large, the resulting acceleration will
be
A) the same
C) one-half as great
B) twice as great
D) four times as great
20. A man weighs 900 Newtons standing on a scale in a
stationary elevator. If some time later the reading on the
scale is 1200 Newtons, the elevator must be moving
with
A)
B)
C)
D)
constant acceleration downward
constant speed downward
constant acceleration upward
constant speed upward
21. Base your answer to the following question on Two
forces are applied to a 2.0-kilogram block on a
frictionless horizontal surface, as shown in the diagram
below.
26. A 60.-kilogram physics student would weigh 1560
newtons on the surface of planet X. What is the
magnitude of the acceleration due to gravity on the
surface of planet X?
A) 0.038 m/s 2
C) 9.8 m/s 2
The acceleration of the block is
A) 5.0 m/s 2 to the right B) 5.0 m/s 2 to the left
C) 3.0 m/s 2 to the right D) 3.0 m/s 2 to the left
22. 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 × 10 0 N
C) 6.7 × 10 –11 N
B) 3.3 × 10 –10 N
D) 1.3 × 10 –11 N
23. Base your answer to the following question on In the
graph below, the acceleration of an object is plotted
against the unbalanced force on the object.
What is the object's mass?
A) 1 kg
B) 2 kg
C) 0.5 kg D) 0.2 kg
24. If the mass of one of two objects is increased, the force
of attraction between them will
A) decrease
C) remain the same
B) increase
25. When a satellite is a distance from the center of
Earth, the force due to gravity on the satellite is .
What is the force due to gravity on the satellite when its
distance from the center of Earth is ?
A)
B)
C)
D)
B) 6.1 m/s 2
D) 26 m/s 2
27. The acceleration due to gravity on the surface of planet X is 19.6 meters per second 2. If an object on the surface
of this planet weighs 980. newtons, the mass of the
object is
A) 50.0 kg
C) 490. N
B) 100. kg
D) 908 N
28. A box is pushed toward the right across a classroom
floor. The force of friction on the box is directed
toward the
A) left
C) ceiling
B) right
D) floor
29. Sand is often placed on an icy road because the sand
A) decreases the coefficient of friction between the
tires of a car and the road
B) increases the coefficient of friction between the
tires of a car and the road
C) decreases the gravitational force on a car
D) increases the normal force of a car on the road
30. If a 30-Newton force is required to accelerate a
2-kilogram object at 10 meters per second 2, over a level
floor, then the magnitude of the frictional force acting
on the object is
A) 0 N
B) 10 N C) 20 N D) 30 N
31. Base your answer to the following question on A book
weighing 20. Newtons slides at constant velocity down
a ramp inclined 30.º to the horizontal as shown in the
diagram below.
What is the force of friction between the book and the
ramp?
A)
B)
C)
D)
10. N up the ramp
17 N up the ramp
10. N down the ramp
17 N down the ramp
32. Jill is pulling a 200. Newton sled through the snow at
constant velocity using a horizontal force of 10.
Newtons. What is the kinetic coefficient of friction of
the sled on the snow?
A) 0.02
B) 0.05
C) 0.20
D) 20
33. Jim wishes to push a 100. N wood crate across a wood
floor.What is the minimum horizontal force that would
be required to start the crate moving?
A) 30. N B) 42 N C) 72 N D) 100 N
34. Base your answer to the following question on The vector diagram below represents two forces, F 1 and F 2
simultaneously acting on an object.
Which vector best represents the resultant of the two forces?
A)
B)
C)
D)
35. Base your answer to the following question on The
vector diagram below represents the horizontal
component, FH, and the vertical component, FV, of a
24-newton force acting at 35° above the horizontal.
40. A 10.-kilogram rubber block is pulled horizontally at
constant velocity across a sheet of ice. Calculate the
magnitude of the force of friction acting on the block.
[Show all work, including the equation and substitution
with units.]
Base your answers to questions 41 through 44 on the
information below.
A horizontal force of 8.0 newtons is used to pull
a 20.-newton wooden box moving toward the right
along a horizontal, wood surface, as shown.
What are the magnitudes of the horizontal and vertical
components?
A)
B)
C)
D)
FH = 3.5 N and FV = 4.9 N
FH = 4.9 N and FV = 3.5 N
FH = 14 N and FV = 20. N
FH = 20. N and FV = 14 N
36. A 70-kilogram hockey player skating east on an ice
rink is hit by a 0.1-kilogram hockey puck moving
toward the west. The puck exerts 50-newton force
toward the west on the player. Determine the
magnitude of the force that the player exerts on the
puck during this collision.
37. A 1500-kilogram car accelerates at 5.0 meters per
second 2 on a level, dry, asphalt road. Determine the
magnitude of the net horizontal force acting on the car.
Base your answers to questions 38 and 39 on the
information below.
A student and the waxed skis he is wearing have
a combined weight of 850 newtons. The skier travels
down a snow-covered hill and then glides to the east
across a snow-covered, horizontal surface.
38. Determine the magnitude of the normal force exerted
by the snow on the skis as the skier glides across the
horizontal surface.
_______________________ N
39. Calculate the magnitude of the force of friction acting
on the skis as the skier glides across the snow-covered,
horizontal surface. [Show all work, including the
equation and substitution with units.]
41. Calculate the magnitude of the frictional force acting on
the box. [Show all work, including the equation and
substitution with units.]
42. Determine the mass of the box.
43. Determine the magnitude of the net force acting on the
box.
44. Calculate the magnitude of the acceleration of the box.
[Show all work, including the equation and substitution
with units.]
45. Base your answer to the following question on the passage and data table below.
The net force on a planet is due primarily to the other planets and the Sun. By taking into account all
the forces acting on a planet, investigators calculated the orbit of each planet. A small discrepancy between the calculated orbit and the observed orbit of the planet Uranus was
noted. It appeared that the sum of the forces on Uranus did not equal its mass times its acceleration,
unless there was another force on the planet that was not included in the calculation. Assuming that this
force was exerted by an unobserved planet, two scientists working independently calculated where this
unknown planet must be in order to account for the discrepancy. Astronomers pointed their telescope
s in the predicted direction and found the planet we now call Neptune.
The diagram represents Neptune, Uranus, and the Sun in a straight line. Neptune is 1.63 × 10 12 meters from
Uranus. Calculate the magnitude of the interplanetary force of attraction between Uranus and Neptune at this
point. [Show all work, including the equation and substitution with units.]