Chapter 10 Engineering Fundamentals:
An Introduction to Engineering
1. Force is a fundamental dimension.
a. True
b. False
2. Which of the following statements best describes what weight is?
a. Weight is the amount of mass something has.
b. Weight is resistance to acceleration.
c. Weight is a force due to gravity acting on a mass.
d. Weight describes how massive something is.
Analysis:
3. A single force can exist all by itself.
a. True
b. False
4. Forces always come in pairs, equal in magnitude and opposite in direction.
a. True
b. False
5. All forces result from direct contact.
a. True
b. False
6. If you drop your textbook, it falls because the earth pulls it downward. At the same time, your
textbook pulls on the earth with a force that is
a. equal to the downward pull on the textbook and in the same direction.
b. equal to the downward pull on the textbook but in the opposite direction.
c. immeasurably small.
d. zero.
Analysis:
7. A satellite orbits the earth instead of flying off into space because
a. rocket thrusters continuously push it towards the earth.
b. solar reflectors continuously push it towards the earth.
c. wind sails continuously push it towards the earth.
d. gravity continuously pulls it towards the earth.
Analysis:
8. Which of the following is the SI unit for force?
a. Pounds
b. Newtons
c. Grams
d. Kilograms
Analysis:
Engineering Fundamentals, 5th ed. Chapter 10
Saeed Moaveni
9. The physical quantity of force is a vector quantity (has direction).
a. True
b. False
10. The physical quantity of force has
a. magnitude only.
b. direction only.
c. both magnitude and direction.
d. neither magnitude nor direction.
Analysis:
11. Unlike many other vector quantities, which are defined by their magnitude and direction,
force is also defined by its
a. color.
b. duration.
c. length.
d. point of application.
Analysis:
12. Forces tend to do what to objects upon which they act?
a. move them
b. rotate them
c. elongate them
d. all of the above
Analysis:
13. A force that will accelerate 1 kilogram of mass at a rate of
2
1s
m
is known as a
a. pound.
b. Newton.
c. ton.
d. metric ton.
Analysis:
14. One Newton is equal to
a.
2
1s
mkg
b.
s
mkg
1
c.
2
2
1s
mkg
d.
2
2
1s
mkg
Engineering Fundamentals, 5th ed. Chapter 10
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15. A force that will accelerate 1 slug of mass at a rate of
2
1s
ft
is known as a
a. pound force.
b. Newton.
c. ton.
d. metric ton.
Analysis:
16. Over the elastic range, the deformation of a spring is directly proportional to
a. the amount of stretch.
b. the amount of compression.
c. the applied force.
d. the spring constant.
Analysis:
17. The value of the spring constant depends on
a. the type of material used to make the spring.
b. the shape and winding of the spring.
c. all of the above
d. none of the above; that’s why it’s called a “constant.”
18. A force of
N10
causes a spring to stretch
cm50
. What is the spring constant?
a.
cmN500
b.
m
N
2.0
c.
N
cm
5
d.
m
N
20
Analysis:
19. If you push sideways gently on your textbook and it doesn’t move, it is most likely because
a. the book’s mass is large enough to resist your push.
b. your push is too small to overcome the book’s inertia.
c. friction is pushing on the book in the opposite direction as your push.
d. of none of the above.
Analysis:
20. What does
stand for in the following equation?
NF
max
a. coefficient of friction
b. coefficient of restitution
Engineering Fundamentals, 5th ed. Chapter 10
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c. spring constant
d. viscosity
Analysis:
21. What does
N
stand for in the following equation?
NF
max
a. Newtons
b. Normal force
c. Natural force
d. Natural frequency
Analysis:
22. The property of a fluid that quantifies fluid friction is
a. coefficient of friction.
b. coefficient of restitution.
c. density.
d. viscosity.
Analysis:
23. The quantity that represents a measure of how easily a given fluid can flow is known as
a. density.
b. specific weight.
c. viscosity.
d. none of the above.
Analysis:
24. In general, the viscosity of gases increases with increasing temperature.
a. True
b. False
25. In general, the viscosity of liquids increases with increasing temperature.
a. True
b. False
26. If an object is at rest and there are no unbalanced forces acting on it, the object will
a. speed up.
b. slow down.
c. remain at rest.
d. none of the above
Analysis:
27. If an object is moving and there are no unbalanced forces acting on it, the object will
a. speed up.
b. slow down.
c. continue moving at a constant velocity.
d. none of the above
Analysis:
28. If you push on your textbook so that it slides across the table at a constant velocity,
a. there must not be any forces acting on the book, otherwise it would accelerate.
b. all of the forces acting on the book must be balanced.
c. the book must be changing direction.
d. none of the above
Analysis:
29. If you drop your textbook, it speeds up while it is falling, and therefore
a. there are no forces acting on the book.
b. all of the forces acting on the book are balanced.
c. the forces acting on the book are unbalanced.
d. none of the above
30. Objects at rest tend to remain at rest and objects in motion tend to remain in motion, unless
acted upon by an unbalanced external force. This is a basic description of
a. Newton’s 1st Law.
b. Newton’s 2nd Law.
c. Newton’s 3rd Law.
d. Newton’s 4th Law.
Analysis:
31. In his second law, Newton observed that force and acceleration are
a. inversely proportional.
b. directly proportional.
c. all of the above.
d. none of the above.
Analysis:
32. The acceleration of an object is directly proportional to the force that is causing the
acceleration. This is a basic description of
a. Newton’s 1st Law.
b. Newton’s 2nd Law.
c. Newton’s 3rd Law.
d. Newton’s 4th Law.
Engineering Fundamentals, 5th ed. Chapter 10
Saeed Moaveni
Analysis:
33. A force tends to cause an object to accelerate. The force and the resulting acceleration have
a. the same direction.
b. different directions.
c. no relationship between their directions.
d. none of the above
Analysis:
34. If you push on the wall with a force of 10 pounds, the wall pushes back on you with a force
of 10 pounds. This is a basic description of
a. Newton’s 1st Law.
b. Newton’s 2nd Law.
c. Newton’s 3rd Law.
d. Newton’s 4th Law.
Analysis:
35. The weight of an object is the force that is exerted on the mass of the object by the earth’s
gravity.
Engineering Fundamentals, 5th ed. Chapter 10
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a. True
b. False
36. Weight and mass are essentially the same thing.
a. True
b. False
37. What does G stand for in the following equation?
2
21
r
mGm
F
a. Gravity
b. Universal gravitational constant
c. Gallons
d. Weight
Analysis:
38. What does r stand for in the following equation?
2
21
r
mGm
F
a. Radius of the earth
b. Universal gravitational constant
c. Resistance
d. Center-to-center distance between objects
Analysis:
Engineering Fundamentals, 5th ed. Chapter 10
Saeed Moaveni
39. What does F stand for in the following equation?
2
21
r
mGm
F
a. Gravitational force
b. Friction
c. Viscous friction
d. Weight
Analysis:
40. What does W stand for in the following equation?
mgW
a. Weight
b. Work
c. Watts
d. none of the above
Analysis:
41. What does g stand for in the following equation?
mgW
a. Weight
b. Gallons
c. Acceleration due to gravity
d. none of the above
Analysis:
Engineering Fundamentals, 5th ed. Chapter 10
Saeed Moaveni
42. A mosquito flying 3 m/s collides head-on with a car going 55 m/s in the opposite direction.
Which of the following statements is true as a result of the collision?
a. The car experiences the greater impact force.
b. The mosquito experiences the greater impact force.
c. The car experiences the greater acceleration.
d. The mosquito experiences the greater acceleration.
Analysis:
43. A tow truck exerts a force of
N2000
on a car, causing it to accelerate at
2
4s
m
. What is the
mass of the car?
a.
500kg
b.
750kg
c.
1000kg
d.
1500kg
e. None of the above
Analysis:
44. A tow truck exerts a force of 2000 N on a car, causing it to accelerate at 3 m/s . What is the
mass of the car?
a. 35 kg
b. 450 kg
c. 667 kg
d. 1459 kg
Analysis: