Deck 10: Force and Force-Related Variables in Engineering

Question 1

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."

Answer 1

C

Question 2

A force that will accelerate 1 kilogram of mass at a rate of is known as one

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

Answer 2

B

Question 3

Force is a fundamental dimension.

Answer 3

False

Question 4

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

Question 5

A single force can exist all by itself.

Question 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.

Question 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.

Question 8

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)none of the above

Question 9

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

Question 10

One Newton is equal to

A)
B)
C)
D)

Question 11

A force of 20 N causes a spring to stretch 5 cm.What is the spring constant?

A)1 N/m
B)2 N/m
C)20 N/m
D)400 N/m

Question 12

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 13

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 14

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

Question 15

Over the elastic range, the deformation of a spring is inversely proportional to

A)the amount of stretch.
B)the amount of compression.
C)the applied force.
D)the spring constant.

Question 16

Which of the following is the SI unit for force?

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

Question 17

A force that will accelerate 1 slug of mass at a rate of is known as a

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

Question 18

All forces result from direct contact.

Question 19

The physical quantity of force has

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

Question 20

Forces tend to do what to objects upon which they act?

A)move them
B)rotate them
C)elongate, shorten them, or bent them
D)all of the above

Question 21

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

Question 22

What does G stand for in the following equation?

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

Question 23

Weight and mass are essentially the same thing.

Question 24

If you push on the wall with a force of 10 N the wall pushes back on you with a force of 10 N.This is a basic description of

A)Newton's 1st Law
B)Newton's 2nd Law
C)Newton's 3rd Law
D)None of the above

Question 25

If you drop your textbook, while it is falling it speeds up, 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 26

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 27

What does r stand for in the following equation?

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

Question 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

Question 29

What does stand for in the following equation?

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

Question 30

What does stand for in the following equation?

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

Question 31

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

Question 32

What does F stand for in the following equation?

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

Question 33

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

Question 34

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

Question 35

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 36

When a force causes 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 37

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

Question 38

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 39

The property of a fluid that quantifies fluid friction is called

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

Question 40

What does W stand for in the following equation?

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

Question 41

If a small sports car collides head-on with a massive truck, which vehicle experiences the greater impact force? Which vehicle experiences the greater acceleration due to the impact?

Question 42

The modulus of elasticity is a measure of how easily a material will stretch when pulled (subject to a tensile force) or how well the material will shorten when pushed (subject to a compressive force).

Question 43

Pressure is a fundamental dimension.

Question 44

A "teeter-totter" (or "see-saw" if you prefer) has a 22.68 kg child sitting at one end, 3.05 m from the center pivot point (fulcrum).How far from the center point should a 56.70 kg adult sit in order to balance the teeter-totter?

A)0.76 m
B)1.22 m
C)1.98 m
D)3.05 m

Question 45

A tow truck exerts a force of on a car, causing it to accelerate at .What is the mass of the car?

A)45 slugs
B)45 lbm
C)45 kg
D)None of the above

Question 46

A ductile material shows little or no permanent deformation before it ruptures.

Question 47

Calculate the torque produced by a 50 N perpendicular force at the end of a 20 cm-long wrench.

A)10 N.m
B)1000 N.m
C)2.5 N/m
D)0.4 cm/N

Question 48

A "suction cup" sticks to the wall because it is

A)pulled to the wall by vacuum
B)pushed to the wall by the atmospheric pressure
C)both of these
D)none of the above

Question 49

What is the SI unit for pressure?

A)
B)
C)
D)

Question 50

Geometric properties of an object such as its length, area, and first and second moment of area do not play significant roles in the way the object responds to a force.

Question 51

The absolute pressure is related to the gauge pressure according to

Question 52

The modulus of elasticity, or Young's modulus, is computed by calculating the slope of a stress-strain diagram over the elastic region.

Question 53

Identify the force that accelerates a car:

A)the car pushing on the road
B)the road pushing on the car
C)the engine pushing on the wheels
D)the wheels pushing on the engine

Question 54

Stress provides a measure of the intensity of internal forces acting over an area.

Question 55

The value of fluid bulk modulus shows how easily the volume of the fluid can be reduced when the pressure acting on it is increased.

Question 56

What does g stand for in the following equation?

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

Question 57

The modulus of rigidity is a measure of how easily a material can be twisted or sheared.

Question 58

Linear impulse represents the net effect of a force acting over a period of time and brings about a change in the linear momentum of the object.

Question 59

A tow truck exerts a force of on a car, causing it to accelerate at .What is the mass of the car?

A)
B)
C)
D)
E)None of the above

Question 60

A brittle material, when subjected to a tensile load, will go through significant permanent deformation before it breaks.

Question 61

Mechanics deals with the study of behavior of objects or structural members when subjected to forces.