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Grade 11 - Physics
Unit 2 - Review
Name: _______________________
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. What is the difference between a scalar quantity and a vector quantity?
a. A scalar quantity has a magnitude and a direction whereas a vector quantity has only a
magnitude.
b. A scalar quantity is used in the study of kinematics whereas a vector quantity is used in the
study of dynamics.
c. A scalar quantity has no direction whereas a vector quantity has a direction.
d. A scalar quantity has magnitude, units, and a direction whereas a vector quantity has only
magnitude and units.
____
2.
Two people, A and B, are dragging a canoe
across a level beach using light ropes. Person
A applies a force of 40 N and person B
applies a force of 80 N. The force of friction
exerted by the beach on the canoe is 100 N.
What is the net force on the canoe?
a. 220 N [forward]
b. 220 N [backward]
____
c. 20 N [forward]
d. 20 N [backward]
3.
The force shown is applied to a metal block
of weight 200 N in contact with a smooth
wall. What is the minimum magnitude of the
applied force needed to prevent the metal
block from sliding down the wall?
a. 20.0 N
b. 100 N
____
4.
c. 200 N
d. 400 N
In a demonstration, a strong paper sheet is
placed flat on a table surface and a beaker is
placed on top of the paper sheet. If the
demonstrator wants to pull the paper sheet
from beneath the beaker without moving the
beaker, what should be done?
a.
b.
c.
d.
____
Leave the beaker empty of water and pull the paper sheet slowly.
Leave the beaker empty of water and pull the paper sheet rapidly.
Half-fill the beaker with water and pull the paper sheet slowly.
Half-fill the beaker with water and pull the paper sheet rapidly.
5. What concept or principle explains why, during rapid braking, the driver feels as if she is being thrown
forward?
a. the normal force
b. deceleration
____
c. the applied force
d. inertia
6. Which of the following statements are correct for a motorist in a vehicle?
I.
II
III
Inertia of a motorist makes her feel like she is being pushed backward when the
acceleration of the vehicle is in the same direction as its velocity.
Inertia of a motorist makes her feel like she is being thrown forward when the direction
of the acceleration of the vehicle is opposite to the direction of its velocity.
Inertia of a motorist makes her feel she is being thrown inward when the direction of the
velocity changes as the vehicle accelerates around a curve.
Choose your answer from the following.
a. I and II only
b. I and III only
c. II and III only
d. I, II, and III
____
7. Which of the following statements is always true for an object?
a. If the velocity of an object is zero, no force is acting on it.
b. If an object is moving, a net force is acting on it.
c. If an object is moving, it has a natural tendency to keep moving.
d. If an object is moving, it has a natural tendency to come to rest.
____
8. A box of mass 5.0 kg is moving on a smooth ice surface with a velocity of 6.0 m/s [right]. A constant force is
applied for 3.0 s and the box reaches a final velocity of 12 m/s [left]. What was the applied force?
a. 10 N [left]
b. 10 N [right]
c. 30 N [left]
d. 30 N [right]
____
9. A car of mass 1500 kg and travelling at 5.0 m/s [east] accelerates for 10 s to a velocity of 24 m/s [east]. What
is the net force on the car?
a. 7.5 102 N [east]
c. 3.6 103 N [east]
3
b. 2.9 10 N [east]
d. 4.4 103 N [east]
____ 10.
A changing force, as indicted by the graph,
acts on an object of mass 4.0 kg that is
initially at rest on a frictionless surface. The
direction of application of the force is
constant.
What is the velocity of the object in the
direction of the force after 4.0 s?
a. 5.0 m/s
b. 10 m/s
c. 20 m/s
d. 23 m/s
____ 11.
An 8.0-kg oak block, X, on a horizontal,
rough oak surface is attached by a light string
that passes over a light, frictionless pulley to
a hanging 4.0-kg mass, Y, as shown. The
magnitude of the force of friction on block X
is 24 N. ( = 9.81 m/s2 [down])
Which of the following statements is correct?
a. The acceleration of block X to the right is less than the acceleration of block Y downward
because of the friction on block X.
b. The acceleration of block X to the right has the same magnitude as the acceleration of
block Y downward and is slightly less than 9.81 m/s2.
c. The acceleration of block X to the right has the same magnitude as the acceleration of
block Y downward and is much less than 9.81 m/s2.
d. The acceleration of block Y to the right has the same magnitude as the acceleration of
block Y down and is 9.81 m/s2.
____ 12. Action and reaction forces always occur in pairs. They do not result in a net force of zero because
a. the action force is greater than the reaction force
b. the action and reaction forces act on different objects
c. the action and reaction forces act in the same direction
d. the reaction force acts after the action force
____ 13. Three identical spring scales, calibrated in newtons, are attached together and to a hook on a rigid fixed wall,
as shown. When a hand pulls on spring scale Z, the scale reads 12 N. What are the readings on spring scales X
and Y?
a. X = 12 N; Y = 0.00 N
b. X = 6.0 N; Y = 6.0 N
c. X = 4.0 N; Y = 8.0 N
d. X = 12 N; Y = 12 N
____ 14.
A person exerts a force of 200 N [330] on a
box resting on a table surface, as shown, but
the box remains at rest. What is the force of
static friction acting on the box?
a. 173 N [0]
b. 173 N [150]
c. 173 N [180]
d. 200 N [150]
____ 15. Which of the following statements about the coefficients of static friction,
correct?
a. Both and
are proportionality constants and have the same value.
b. For the same pair of surfaces in contact,
is usually smaller than .
c. Both
and
depend on the whether the surface is wet or dry.
d. Both
and
depend on the area of the surfaces in contact.
, and kinetic friction,
, is
____ 16.
A penny, a quarter, and a toonie are
released on Earth at the same time from a
position 3.0 m above the floor. Assume
that they all have the same thickness and
that they fall with their faces horizontal.
Their mass (m), cross-sectional area (A),
and mass divided by cross-sectional area
(m/A) are shown in the table. Which coin
reaches the floor first if air resistance is
significant?
a.
b.
c.
d.
Coin
penny
quarter
toonie
Mass, m
(g)
2.4
5.9
7.30
Area, A
(cm2)
2.8
4.3
6.2
Mass/Area,
m/A (g/cm2)
0.83
1.4
1.2
penny
quarter
toonie
all coins reach the floor at the same time
____ 17. The derived unit for the universal gravitational constant, G, is
a. N·m·kg–1
c. N·m2·kg–2
–1
b. N·kg·m
d. N·kg2·m–2
____ 18. Two students studying in a library are separated by a distance
them is now one-third as great as before.
. They move so that the distance between
The force of gravitational attraction between them is now
a. one-ninth as great
b. one-third as great
c. three times greater
d. nine times greater
____ 19. Planet P has the same radius as Earth but three times the mass of Earth.
The ratio of the force of gravity on the surface of planet P to the force of gravity on the surface of planet Earth
is
a. 1:3
b. 3:1
c. 1:9
d. 9:1
____ 20.
An 80.0-kg athlete is shown standing on a
bathroom scale in an elevator in a fitness
centre on Earth, where the magnitude of the
gravitational field strength, , is 9.81 N/kg.
The reading on the bathroom scale is 981 N.
Which statement(s) below is/are correct for
the motion of the elevator?
Choose your answer from the following.
I
The elevator may be moving upward with increasing speed.
II
The elevator may be moving downward with decreasing speed.
III The elevator may be stopped at a floor.
V
The elevator may be moving upward with constant speed.
a. I only
b. I and II only
c. III only
d. III and IV only