Deck 10: Force and Force-Related Variables in Engineering

Question 1

All forces result from direct contact.

Answer 1

False

Question 2

The physical quantity of force has

A) magnitude only.
B) direction only.
C) both magnitude and direction.
D) neither magnitude nor direction.

Answer 2

C

Question 3

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.

Answer 3

D

Question 4

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.

Question 5

Which of the following is the SI unit for force?

A) Pounds
B) Newtons
C) Grams
D) Kilograms

Question 6

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."

Question 7

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.

Question 8

Force is a fundamental dimension.

Question 9

The physical quantity of force is a vector quantity (has direction).

Question 10

Forces always come in pairs, equal in magnitude and opposite in direction.

Question 11

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.

Question 12

A force that will accelerate 1 slug of mass at a rate of $1 \mathrm { f t } / \mathrm { s } ^ { \mathrm { 2 } }$ is known as a

A) pound force.
B) Newton.
C) ton.
D) metric ton.

Question 13

A single force can exist all by itself.

Question 14

A force of 10N causes a spring to stretch 50cm. What is the spring constant?

Question 15

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.

Question 16

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

Question 17

What does $\mu$ stand for in the following equation? $F _ { \max } = \mu N$

A) coefficient of friction
B) coefficient of restitution
C) spring constant
D) viscosity

Question 18

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.

Question 19

One Newton is equal to

Question 20

A force that will accelerate 1 kilogram of mass at a rate of $1 \mathrm {~m} / \mathrm { s } ^ { \mathrm { 2 } }$ is known as a

A) pound.
B) Newton.
C) ton.
D) metric ton.

Question 21

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

Question 22

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

Question 23

In general, the viscosity of gases increases with increasing temperature.

Question 24

What does r stand for in the following equation? $F = \frac { G m _ { 1 } m _ { 2 } } { r ^ { 2 } }$

A) Radius of the earth
B) Universal gravitational constant
C) Resistance
D) Center-to-center distance between objects

Question 25

Weight and mass are essentially the same thing.

Question 26

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

Question 27

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

Question 28

The weight of an object is the force that is exerted on the mass of the object by the earth's
gravity.

Question 29

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

Question 30

The acceleration of an object is directly proportional to the force that is causing the acceleration. This is a basic description of

Question 31

What does W stand for in the following equation? $W = m g$

A) Weight
B) Work
C) Watts
D) none of the above

Question 32

What does G stand for in the following equation? $F = \frac { G m _ { 1 } m _ { 2 } } { r ^ { 2 } }$

A) Gravity
B) Universal gravitational constant
C) Gallons
D) Weight

Question 33

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.

Question 34

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.

Question 35

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

Question 36

What does F stand for in the following equation? $F = \frac { G m _ { 1 } m _ { 2 } } { r ^ { 2 } }$

A) Gravitational force
B) Friction
C) Viscous friction
D) Weight

Question 37

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

Question 38

What does $N$ stand for in the following equation? $F _ { \max } = \mu N$

A) Newtons
B) Normal force
C) Natural force
D) Natural frequency

Question 39

The property of a fluid that quantifies fluid friction is

A) coefficient of friction.
B) coefficient of restitution.
C) density.
D) viscosity.

Question 40

In general, the viscosity of liquids increases with increasing temperature.

Question 41

A tow truck exerts a force of 2000N on a car, causing it to accelerate at $4 \mathrm {~m} / \mathrm { s } ^ { 2 }$ . What is the mass of the car?

A) 500kg
B) 750kg
C) 1000kg
D) 1500kg
E) None of the above

Question 42

A tow truck exerts a force of 2000 N on a car, causing it to accelerate at $3 \mathrm {~m} / \mathrm { s }$ . What is the mass of the car?

A) 35 kg
B) 450 kg
C) 667 kg
D) 1459 kg

Question 43

What does g stand for in the following equation? $W = m g$

A) Weight
B) Gallons
C) Acceleration due to gravity
D) none of the above

Question 44

A mosquito flying 3 m/s collides head-on with a car going 55 m/ $\mathrm { m } / \mathrm { s }$ 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.