Name: ________________________
Exam 1--PHYS 151--S16
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Which of these is the standard of measurement for
the unit length?
a. the distance that light travels in a particular
amount of time
b. the distance across a cesium atom
c. the length of a bar in France
d. the diamater of a particular silicon ball
4. Length and what other 2 quantities make up the
basic units for measurements in physics?
a. mass and inertia
b. force and speed
c. mass and time
d. speed and time
e. time and momentum
2. Consider this expression. What are its units?
(t has units of seconds ; x has units of meters; a has
units of m/s2)
5. What is the approximate height of a person in
meters?
a. 2 m
b. 20 m
c. 200 m
d. 2000 m
1 xa
2 t
6. Volume flow rate is a measure of fluid flow; it is a
volume per unit time. If the rate is expressed in the
SI system, what will the units be?
ft 3
a.
hr
2
a.
b.
c.
d.
m
s
m
s
s
m2
s3
b.
c.
3. If the displacement of an object, x, is related to
velocity, v, according to the relation x = Av, the
constant, A, has the dimension of which of the
following?
a.
b.
c.
d.
d.
m3
s
cm3
s
yard 3
minute
7. If a is acceleration, v is velocity, x is position,
and t is time, then which equation is not
dimensionally correct?
a
a. v =
t
x
b. t =
v
2x
c. t 2 =
a
acceleration
area
length
time
d.
1
a=
v2
x
8. An isometric contraction occurs when the tension
in the muscle increases and ___________.
a. the muscle does get shorter
b. the muscle doesn’t get shorter
c. neither of these
13. The bicep muscle is attached on the scapula
(shoulder) and the upper forearm. What is the
insertion point for this muscle?
a. forearm
b. scapula
c. elbow
d. wrist
9. Which of these is a type of movement caused by
the body’s muscles
a. gliding
b. rotation
c. angular movement
d. all of these
14. Why does your car lurch forward just before
coming to a stop?
a. static frictional force is smaller than kinetic
frictional force
b. the Anti-lock braking system causes this to
happen for safety
c. the brakes let off of the rotor just before
stopping
d. static frictional force is larger than kinetic
frictional force
10. In synovial joints, _____________ covers the ends
of the bones.
a. muscles
b. cartilage
c. tendons
d. calcium deposits
15. What happens to the normal force on the block
(with mass m) as the angle of the inclined plane (θ)
is increased?
11. The deltoid muscle, attached at the shoulder, helps
one to lift their arms out to the side. It is very
difficult to lift heavy weights in this way because...
a.
b.
c.
d.
a.
b.
c.
d.
the deltoid muscle cannot apply a torque to the
humerus (upper arm bone)
the length of the moment arm is large
the angle between the applied force from the
deltoid and the humerus is small
the deltoid muscles are typically very weak
the normal force increases
the normal force decreases
the normal force stays the same
the normal force is only dependent on the mass
of the block
16. Consider the inclined plane in the previous
problem. As the angle, θ, increases, what happens
to the static frictional force?
a. it increases
b. it decreases
c. it remains the same
d. it depends on the mass of the block
12. The head can rock back and forth. What is the
insertion point for the muscles that primarily allow
for this motion?
a. no muscles are attached; you can move your
head by changing the center of mass
b. on the shoulders
c. on the front part of the neck
d. at the back of the head
17. You pull on the end of a rope with 50 N of force.
A friend holds the other end and has to pull back
with 50 N of force. What is the tension in the
rope?
a. 0 N
b. 50 N
c. 100 N
d. 200 N
2
21. Two movers push horizontally on a refrigerator.
One pushes east with a force of 200 N; the other
pushes west with a force of 100 N. If the mass of
the refrigerator is 200 kg, what is its acceleration.
18. You want to move a heavy block across a rough
surface. Which of the following arrows,
representing the direction of the force vector, show
the easiest way to move the box?
a.
b.
c.
a.
b.
c.
d.
e.
a
b
both are the same
22. A hockey puck slides on ice at constant velocity.
What is the net force acting on the puck?
a. more than its weight
b. equal to its weight
c. less than its weight but more than zero
d. zero
e. it depends on the speed of the puck
19. Consider this metal plate. Which of the labeled
points best represents the center of mass for the
metal plate?
a.
b.
c.
d.
e.
2 m/s2 to the east
0.5 m/s2 to the east
1.5 m/s2 to the east
1.0 m/s2 to the west
0.5 m/s2 to the west
23. Newton’s First Law is a description of which of
these properties?
a. forces
b. acceleration
c. action-reaction
d. inertia
a
b
c
d
e
24. A car is difficult to push because...
a. it has a large weight
b. it has a lot of momentum
c. it has much impetus
d. it has a lot of inertia
20. This figure shows a traction system. A mass of
m=2kg is used. What is the force applied to the
patient’s leg?
25. A block of mass m rests on the floor of an elevator
that is moving upward at an increasing speed.
What is the relationship between the normal force
(FN) and the force due to gravity (F W) on the
block?
a.
b.
c.
d.
e.
a.
b.
c.
d.
0.2 N
2N
1N
10 N
20 N
3
FN<FW but not zero
FN=FW
FN=0 N
FN>FW
30. A 30 kg girl sits on the end of a see-saw 2 meters
from the fulcrum. The see-saw is 4 meters long.
How far from the fulcrum must the girl’s mother,
whose mass is 60 kg, sit to balance the see-saw?
26. Newton’s _______ law is called the law of
_________.
a. first, inertia
b. second, reaction
c. third, acceleration
d. first, acceleration
e. second, inertia
27. To lift a 10 N object, your bicep must exert with a
total force of 100 N. What is the force of the
muscle at the insertion point (ie., the end of the
muscle attached to a moving bone)?
a. 200 N
b. 100 N
c. 50 N
d. 10 N
a.
b.
c.
d.
e.
31. This figure shows wrenches and an applied force,
which is represented by the arrow. Rank the
torques provided by the wrenches from greatest to
least torque. (The force on the wrench in (d) is
twice that on the other 3 wrenches. The length of
wrench (c) is twice that of wrenches a, b, and d.)
28. Consider these body parts. What type of lever are
they (in order from left to right)?
a.
b.
c.
d.
1,3,2
1,2,3
2,3,1
3,2,1
a.
b.
c.
d.
29. Consider these levers. The block on each is the
same mass. Which lever requires the most force, F,
to hold the block up as shown?
a.
b.
c.
1m
0.5 m
3m
1.5 m
2m
d>b>c>a
c>d>a>b
d≈c>b>a
b≈c>a>d
32. A person holds a dumbbell as in this figure. If the
dumbbell has a weight of 20 pounds. What best
describes the force exerted by the bicep muscle?
a
b
c
a.
b.
c.
4
= 20 pounds
> 20 pounds
< 20 pounds
33. Torques are relevant in which of these types of
motion:
a. translational motion
b. oscillatory motion
c. forced motion
d. rotational motion
37. You put a straw into a glass of water, place your
finger over the top so no air can get in or out, and
then lift the straw from the liquid. You find that
the straw retains some liquid. How does the air
pressure P in the upper part compare to
atmospheric pressure P A?
34. The following is a diagram for a hydraulic jack.
The area of the piston on the left is A 1; the area of
the right piston is A 2. A2 is 3 times bigger than A1.
If the input force is F 1=60 N, what force is exerted
by the right piston?
a.
b.
c.
d.
a.
b.
c.
d.
e.
P>PA
P=PA
P<PA
it depends on the density of the liquid
38. A gas is confined to a container with constant
volume. The amount of gas is constant. By what
factor will the pressure change if the temperature
triples?
a. 3.0
b. 1/3
c. 1/9
d. 9.0
20 N
40 N
60 N
120 N
180 N
39. A lady in high heels exerts about 50 pounds of
force on the heel of one foot. If the high heel of
her shoe has an area of one-half square inch, what
pressure is exerted on the ground by the heel?
(psi=pounds per square inch)
35. When you drink liquid through a straw, which of
the items listed below is primarily responsible for
this to work?
a. gravity
b. atmospheric pressure
c. inertia
d. water pressure
e. mass of the water
a.
b.
c.
d.
36. Two identical cylinders at the same pressure
contain the same type of gas. If container A has 4
times the amount of gas as container B, which has
the higher temperature?
a. A
b. B
c. both the same
d. not enough information
25 psi
50 psi
100 psi
200 psi
40. There are three sources of pressure; two of these
are: 1) molecular interactions within a fluid and 2)
the weight of a fluid. What is the third source of
pressure?
a. phase transformation
b. mass of a fluid
c. temperature of a fluid
d. an external force applied to a fluid
5
ID: A
Exam 1--PHYS 151--S16
Answer Section
MULTIPLE CHOICE
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ID: A
40. ANS: D
PTS: 1
REF: S16
2