Download Ch 2 Kinematics - Practice

ID: A
Ch 2 Kinematics - Practice
Multiple Choice
1. A toy car is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s-. What is
the final velocity after 6.0 s?
a. 10.0 m/s
c. 16 m/s
b. 12 m/s
d. 17 m/s
2. A marble accelerates from rest at a constant rate and travels for a total displacement of 44 m in 20.0 s. What
is the average velocity of the marble?
a. 1.1 m/s
c. 4.4 m/s
b. 2.2 m/s
d. 0.0 m/s
3. A curious kitten pushes a ball of yarn at rest with its nose, displacing the ball of yarn 17.5 em in 2.00 s. What
is the acceleration of the ball of yarn?
a. 11.0 cm/sc. 14.4 cm/sb. 8.75 cm/sd. 4.38 cm/s-
4. Acceleration due to gravity is also called
a. negative velocity.
b. displacement.
c.
d.
free-fall acceleration.
instantaneous velocity.
5. The baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt.
At what point in the ball's path does it experience zero velocity and nonzero acceleration at the same time?
a. midway on the way up
h. at the top of its trajectory
c. the instant it leaves the catcher's hand
d. the instant before it arrives in the catcher's mitt
6. A rock is thrown straight upward with an initial velocity of 24.5 mls where the downward acceleration due to
gravity is 9.81 m/s-. What is the rock's displacement after 1.00 s?
a. 9.81 m
c. 24.5 m
b. 19.6 m
d. 29.4 m
7. A coin released at rest from the top of a tower hits the ground after falling 1.5 s. What is the speed of the coin
as it hits the ground? (Disregard air resistance. g = 9.81 m/s-.)
a. 15 m/s
c. 31 mls
b. 21 mls
d. 39 mls
ID: A
8. Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your fmger and thumb
and releases it without warning, how far can you expect the ruler to fall before you catch it? (Disregard air
resistance. g = 9.81 m/s")
c. at least 16.0 em
a. at least 4.0 em
b. at least 9.8 em
d. at least 19.6 em
9. When there is no air resistance, objects of different masses
a. fall with equal accelerations with similar displacements.
b. fall with different accelerations with different displacements.
c. fall with equal accelerations with different displacements.
d. fall with different accelerations with similar displacements.
10. A pair of spectacles are dropped from the top of a 32.0 m high stadium. A pen is dropped 2.0 s later. How
high above the ground is the pen when the spectacles hit the ground? (Disregard air resistance,
g= 9.81 m/st.)
2
ID: A
Ch 2 Kinematics - Practice
Answer Section
MULTIPLE CHOICE
1. D
2. B
3.
4.
5.
6.
7.
8.
9.
B
C
B
B
A
D
A
PROBLEM
10. 3.0
X
101 m
1
ID: A
Ch 4 Dynamics - Practice
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
l.
Which ofthe following is the cause of an acceleration or a change in an object's motion?
a. speed
c. force
b. inertia
d. velocity
2. Which of the following is the tendency of an object to maintain its state of motion?
a. acceleration
c. force
b. inertia
d. velocity
3. A late traveler rushes to catch a plane, pulling a suitcase with a force directed 30.0° above the horizontal. If
the horizontal component of the force on the suitcase is 60.6 N, what is the force exerted on the handle?
c. 65.2 N
a. 53.0 N
b. 70.0 N
d. 95.6 N
4. A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 8.0 x 101 N is being
applied to the sled rope at an angle of 53° to the ground, what is the force of friction between the sled and the
snow?
a. 83 N
c. 48 N
b. 64N
d. 42N
5. If a nonzero net force is acting on an object, then the object is definitely
a. at rest.
c. being accelerated.
b. moving with a constant velocity.
d. losing mass.
6. Two perpendicular forces, one of 45.0 N directed upward and the second of 60.0 N directed to the right, act
simultaneously on an object with a mass of35.0 kg. What is the magnitude of the resultant acceleration of the
object?
a. 2.14 m/s?
c. 5.25 m/s'
d. l.41 m/sb. 3.00 m/s?
7. An elevator weighing 2.00 x 105 N is supported by a steel cable. What is the tension in the cable when the
elevator is accelerated upward at a rate of3.00 mls2? (g= 9.81 m/s")
a. 1.39 x 105 N
c. 2.42 X 105 N
5
h. 2.31 X 10 N
d. 2.61 x lO N
j
1
ID: A
8. A hammer drives a nail into a piece of wood. Identify an action-reaction pair, and compare the forces exerted
by each object.
a. The nail exerts a force on the hammer; the hammer exerts a force on the wood.
b. The hammer exerts a force on the nail; the wood exerts a force on the nail.
c. The hammer exerts a force on the nail; the nail exerts a force on the hammer.
d. The hammer exerts a force on the nail; the hammer exerts a force on the wood.
9. A ball is dropped from a person's hand and falls to Earth. Identify an action-reaction pair, and compare the
forces exerted by each object.
a. The hand exerts a force on the ball; Earth exerts a force on the hand.
b. Earth exerts a force on the ball; the hand exerts a force on Earth.
c. Earth exerts a force on the hand; the hand exerts a force on the ball.
d. Earth exerts a gravitational force on the ball; the ball exerts a gravitational force on
Earth.
10. As
his
a.
b.
c.
d.
a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until
shoes leave the floor. At the moment the player begins to jump, the force of the floor on the shoes is
greater than the player's weight.
equal in magnitude and opposite in direction to the player's weight.
less than the player's weight.
zero.
11. The magnitude of the force of gravity acting on an object is
a. frictional force.
c. inertia.
b. weight.
d. mass.
12. A measure ofthe quantity of matter is
a. density.
b. weight.
c.
d.
force.
mass.
13. A weight of5.00 x 103 N is suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the
right of the object and has a tension, FTl• Cable 2 applies a force upward and to the left at an angle of37.0° to
the negative x-axis and has a tension, F T2. What is F T2?
a. 4440 N
c. 8310 N
b. 6640 N
d. 3340 N
14. A sled weighing 1.0 x 102 N is held in place on a frictionless 20.0° slope by a rope attached to a stake at the
top. The rope is parallel to the slope. What is the normal force of the slope acting on the sled?
a. 94 N
c. 37N
b. 47N
d. 34 N
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ID: A
Ch 4 Dynamics - Practice
Answer Section
MULTIPLE CHOICE
1. C
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
B
B
C
C
A
D
C
D
A
B
12. D
13. C
14. A