Motion in Two Dimensions
Practice Test
1.
In Figure 3-19, what is the total displacement of the object?
a.
75.0 m
b.
0 m
c.
-25.0 m
d.
500.0 m
Hint
2.
What are the components of a vector of magnitude 28.5 km at an angle of 42.0° from the positive
x
-axis?
a.
21.2 km, 19.1 km
b.
21.2 km, -19.1 km
c.
112 km, 91 km
d.
604 km, 544 km
Hint
3.
A car moving north at 8.0×10
1
turns and travels south at 65 km/h. What are the magnitude and direction of the change in velocity?
a.
25 km/h, north to south
b.
25 km/h
c.
145 km/h, north to south
d.
145 km/h, south to north
Hint
4.
A 175-N sign is supported in a motionless position by two ropes that each make 53.0° angles with the horizontal. What is the tension in the ropes?
a.
175 N
b.
146 N
c.
310 N
d.
109 N
Hint
5.
Which of the following situations is physically the most like that depicted in Figure 6-9a?
a.
You jump up in an elevator that is going down.
b.
You slide to the right on the seat of a forward-moving bus.
c.
You step upwards on an upward-moving escalator.
d.
You walk toward the rear of a forward-moving train.
Hint
6.
In Figure 6-7, if the mass of the hammer is 7.26 kg, its center is 0.50 m from the thrower, and it is moving at a speed of 1.5 m/s, what is the force of the chain on the thrower's hands?
a.
33 N, outward
b.
22 N, outward
c.
22 N, inward
d.
33 N, inward
Hint
7.
In a position-time graph,
t represents __________.
a.
time
b.
total distance
c.
temperature
d.
telial
Hint
8.
When there is no relative motion between two surfaces, the force exerted by one surface on the other is called __________.
a.
kinetic friction
b.
the static friction force
c.
the kinetic force
d.
resistance
Hint
9.
You are riding in a boat that is traveling 15.0 m/s in still water. You move from the bow to the stern at 3.0 m/s. What is your speed relative to the water?
a.
15.3 m/s relative to the water
b.
18.0 m/s relative to the water
c.
12.0 m/s relative to the water
d.
9.0 m/s relative to the water
Hint
10.
On a position-time graph, rise = __________.
a.
Δ
d
b.
Δ
v
c.
Δ
t
d.
Δ
s
Hint
11.
A carnival ride has a 3.0-m radius and rotates once every 1.7 s. What is the speed of the rider?
a.
11 m/s
b.
5 m/s
c.
9.4 m/s
d.
3.4 m/s
Hint
12.
A sled of mass 40.0 kg is pulled along flat, snow-covered ground. The static friction coefficient is 0.28, and the kinetic friction coefficient is 0.08. What force will be needed to start the sled moving?
a.
31 N
b.
147 N
c.
392 N
d.
110 N
Hint
13.
How far does a car travel in 30.0 s while its velocity is changing from 50.0 km/h to 80.0 km/h at a uniform rate of acceleration?
a.
5.40×10
2
b.
252 m
c.
1.08 × 10
3
m
d.
1.95 × 10
3
m
Hint
14.
A(n) __________ is a vector that is equal to the sum of two or more vectors.
a.
resultant
b.
graphical representation
c.
addition vector
d.
displacement
Hint
15.
The horizontal distance a projectile travels is the __________.
a.
maximum height
b.
trajectory
c.
torque
d.
range
Hint
16.
The vector sum of two or more forces on an object is called the __________ force.
a.
composite
b.
net
c.
effort
d.
resistant
Hint
17.
The net force is the __________.
a.
apparent weight
b.
force exerted on one surface by another when there is no relative motion between the two
c.
friction between any two objects
d.
vector sum of two or more forces on an object
Hint
18.
If in Figure 5-13 the skier has mass 45 kg and the slope is at 35°, what is the component of the skier's weight perpendicular to the slope?
a.
250 N
b.
it cannot be determined with the given information
c.
440 N
d.
360 N
Hint
19.
In Figure 3-3, if the acceleration were calculated using points at
t
= 0.00 s and
t
= 4.00 s, what would it be?
a.
10.00 m/s
2
b.
5.00 m/s
2
c.
4.00 m/s
2
d.
2.50 m/s
2
Hint
20.
In Figure 6-1, if the baseballs fell a vertical distance of 1.6 m from the first to the last image, what is the time interval between frames?
a.
0.081 s
b.
0.23 s
c.
0.071 s
d.
0.095 s
Hint
