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Transcript
ame: ________________________ Class: ___________________ Date: __________
Exam 1--PHYS 151--Chapter 1
True/False
Indicate whether the statement is true or false.
Select “A” for True and “B” for False.
1. The force is a measure of an object’s inertia.
4. Muscles under tension exert the same amount force
at either end.
2. Newton’s first law says that if an object is moving,
it will slow down unless a force acts upon it.
5. Skeletal muscles control the large, external motion
of the body.
3. The force due to static friction is usually less than
that due to kinetic friction.
6. Joints are the locations where two or more bones
meet.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
11. The force in your bicep muscle attached at your
shoulder and forearm is called a ______________
force.
a. frictional
b. weight
c. tension
d. normal
12. Which of these is not a force given in chapter 1?
7. Newton’s second law is called the law of
_______________.
a. inertia
b. acceleration
c. force
d. reaction
8. Newton’s third law says:
a. for a force, there is an equal and opposite force
b. a force causes acceleration
c. an object tends to stay in its state of motion
unless acted upon by a force
9. Friction is a force that _________________of
motion of two objects as they slide or attempt to
slide across each other.
a. opposes the direction
b. is in the same direction
c. is perpendicular to the direction
10. Which of these scenarios has the most friction?
a. car tires on ice
b. car tires on wet asphalt
c. car tires on dry asphalt
a. friction
b. driving
c. normal
d. tension
e. weight
13. Torques are relevant in which of these types of
motion:
a. oscillatory motion
b. translational motion
c. forced motion
d. rotational motion
1
ame: ________________________
14. How is a torque similar to a force?
a. the torque and force are exactly the same
b. the torque changes the rotational motion; the
force changes the translational motion
c. the torque acts only when the force is
perpendicular to the moment arm
d. the torque and force both have units of
Newtons
15. Which of these is not a type of muscle?
a. digestive
b. smooth
c. cardiac
d. skeletal
16. Muscles are connected to the bones at, at least, two
points. The point attached to the bone that moves
is called what?
a. origin
b. torque point
c. axis of rotation
d. insertion point
17. The standard for the second is based on which of
these:
a. the rotation period of a black hole at the center
of our Galaxy
b. the time it takes for light to travel a certain
distance
c. a certain fraction of the solar day
d. the frequency of the cesium atom
18. Irene is 2 meters tall. A building is 10 meters tall.
How tall is the building in Irene’s?
a. 10 Irenes
b. 2 Irenes
c. 2.5 Irenes
d. 20 Irenes
e. 5 Irenes
19. Which of these is the standard of measurement for
the unit length?
a. the diamater of a particular silicon ball
b. the distance that light travels in a particular
amount of time
c. the distance across a cesium atom
d. the length of a bar in France
20. Consider this equation. What are the units of p?
(g has units of seconds; f has units of meters)
f
p=
g
a. ms
b. s/m
c. s
d. m/s
21. What is the unit for mass in the Systeme
Internationale convention?
a. grams
b. pounds
c. kilograms
d. slugs
22. Which of these is not a function of bones?
a. to act as a lever when moving the body
b. to store minerals for the body
c. support of the body
d. protection of the body
e. all of these are functions of bones
23. In synovial joints, _____________ covers the ends
of the bones.
a. muscles
b. calcium deposits
c. tendons
d. cartilage
24. An isotonic contraction occurs when the muscle
contracts and _________________.
a. the body part moves
b. the body part remains stationary
c. both a & b
25. An isometric contraction occurs when the tension
in the muscle increases and ___________.
a. neither of these
b. the muscle doesn’t get shorter
c. the muscle does get shorter
26. 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
2
ame: ________________________
31. The erector spinae muscles help us to do which of
these?
a. lift heavy objects
b. stand up straight
c. walk
d. move our finger
e. turn our head
32. The force due to the muscles (F m) in this figure
produce ____________________.
27. You hold a 30 newton weight in your hand with
your elbow bent at 90 degrees. Your bicep exerts a
force to hold up the weight. Is this force...
a. more than 30 N
b. less than 30 N
c. equal to 30 N
28. For a system to be in equilibrium, the clockwise
torques must be ______________ the
counterclockwise torques.
a. less than
b. it depends on the direction of rotation
c. equal to
d. greater than
29. The deltoid muscle, shown here, represents what
class of levers?
a. a clockwise torque
b. a counterclockwise torque
c. no torque at all
33. Consider the figure for the previous problem. The
force due to the muscles (F m) in this figure must be
____________ the combined weight of the arms,
trunk, head and neck (W arms+Wthn) for the man to be
in equilibrium.
a. larger than
b. smaller than
c. equal to
34. To balance properly when carrying a heavy box in
front of you, you must______________.
a. lean backwards
b. lean forwards
c. use your leg muscles
d. turn your head back & forth
35. Your head has an approximate mass of 5kg. What
is its weight?
a. 50 N
b. 0.5 N
c. 500 N
d. 5 pounds
a. 1
b. 2
c. 3
d. 4
30. The deltoid muscle must exert a very large force to
lift the arm. Which of these is the best explanation
for this?
a.
b.
c.
d.
the deltoid is a very small muscle
the torque of the deltoid is very small
the lever arm for the muscle force is quite small
the arm is very heavy
3
ame: ________________________
40. A hockey puck slides on ice. If no net force acts on
the puck, what will happen?
a. the puck will continue travelling at constant
velocity
b. the puck will speed up
c. the puck will stop immediately
d. the puck will slow down & eventually stop
41. How does the force of gravity on a stone (F g,s)
compare with the force of gravity on a feather
(Fg,f)?
a. Fg,s>Fg,f
b. Fg,s=Fg,f
c. Fg,s<Fg,f
42. A block sits on the table. When you press down on
the block, the frictional force between the block
and table increases. Why?
a. the gravitational force on the table has inverted
b. the block changes shape and better conforms to
the table
c. the normal force on the block is greater
d. the block is closer to the table
43. Two tug-of-war opponents each pull with a force of
100 N on opposite ends of a rope. What is the
tension in the rope?
a. 50 N
b. 100 N
c. 150 N
d. 200 N
e. 250 N
44. A tire rolls, without skidding, across asphalt. What
is the type of friction between the tire and asphalt?
a. static friction
b. kinetic friction
c. there is no friction
45. What happens to the normal force on the block
(with mass m) as the angle of the inclined plane (θ)
is increased?
36. “Normal” is a mathematical term that means
_________________.
a. equidistant
b. differentiated
c. perpendicular
d. opposite
e. biased
37. 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. a
b. b
c. c
38. Consider these body parts. What type of lever are
they (in order from left to right)?
a. 3,2,1
b. 2,3,1
c. 1,2,3
d. 1,3,2
39. Label each of these levers as either first, second, or
third class.
a.
b.
c.
d.
a.
b.
c.
d.
a:3; b:2; c:1
a:3; b:1; c:2
a:2; b:1; c:3
a:1; b:2; c:3
4
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
ID: A
Exam 1--PHYS 151--Chapter 1
Answer Section
TRUE/FALSE
1.
2.
3.
4.
5.
6.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
F
F
F
T
T
T
PTS:
PTS:
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PTS:
PTS:
PTS:
1
1
1
1
1
1
PTS:
PTS:
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PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
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PTS:
PTS:
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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1
1
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1
MULTIPLE CHOICE
7.
8.
9.
10.
11.
12.
13.
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15.
16.
17.
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19.
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21.
22.
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28.
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30.
31.
32.
33.
34.
35.
36.
ANS:
ANS:
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ANS:
B
A
A
C
C
B
D
B
A
D
D
E
B
D
C
E
D
A
B
D
A
C
C
C
B
A
A
A
A
C
1
ID: A
37.
38.
39.
40.
41.
42.
43.
44.
45.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
B
D
A
A
A
C
B
A
B
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
PTS:
1
1
1
1
1
1
1
1
1
2