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The Physical World of a Machine > Chap. 1,2, & 3 > Flashcards

Chap. 1,2, & 3 Flashcards

0
Q

What is one unit of measuring force?

A

Pound

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1
Q

What is force?

A

Any influence capable of producing a change in the motion of a body

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2
Q

How many ways can force change the motion of a body?

A
  1. It can cause a body to move

2. It can retard or stop a body which is moving

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3
Q

What is resistance?

A

Any force which can stop or retard the movement of a body.

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4
Q

What are examples of resistance?

A

Friction and inertia

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5
Q

What is always present between the contacting surfaces of two objects when they are moving across one another?

A

Friction

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6
Q

The reluctance of a body to a change in motion is __________.

A

Inertia

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7
Q

How is inertia directly related to the quantity of matter in a body?

A

The more mass or matter, the heavier an object is the harder it is to move.

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8
Q

Energy is ________.

A

A force which can cause a body to move

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9
Q

How can inertia be energy?

A

A moving body exhibits a reluctance to be stopped, and can strike another body and cause its motion(to move).

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10
Q

What are some forms of energy?

A

Mechanical, heat, electrical, light, chemical, and sound.

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11
Q

Law of conservation of energy

A

Energy can neither be created or destroyed, but it may change from one form to another

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12
Q

Electrical energy can change into ________.

A

Light, heat, mechanical, or sound energy.

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13
Q

What is an important consideration when dealing with energy?

A

Identifying the state or condition it is in when found.

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14
Q

Kinetic energy is ________ energy. It causes ________ by contacting an object’s surface.

A

Moving, movement

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15
Q

What is potential energy?

A

Stored energy

16
Q

Why does potential energy has the ability to become kinetic energy?

A

It’s physical make up or it’s position above reference point

17
Q

Joule is the unit for work in the _____.

A

Metric system

18
Q

Can kinetic energy be converted into potential energy?

A

Yes

19
Q

The movement of an object through a distance and the ability to get things done is _______.

A

Work

20
Q

______ is the unit for measuring work in hydraulics.

A

Foot-pound(ft. lb)

21
Q

The expression which describes work is:

A

Work = distance moved x force exerted

Ft. lbs) (ft.). (lbs

22
Q

What is the speed or rate at which work is done?

A

Work

23
Q

The description of power is:

A

Distance moved Force exerted
X
(ft.). (lbs)
Power= ______________________________
Time(seconds)

24
Q

Who was James Watt?

A

Scottish inventor who invented the steam engine

25
Q

The unit for measuring power is ________.

A

Horsepower

26
Q

________ is a measure of a force’s intensity.

A

Pressure

27
Q

To determine pressure, the total force is divided by the area of?

A

Square inches

28
Q

The expression used to describe pressure is:

A

Pressure= Total force (lbs)
_________________
Area on which
total force acts (in. sq)

29
Q

The combination of kinetic energy and pressure is ______.

A

Working energy

30
Q

Mechanically, electrically, pneumatically, or hydraulically are the energy source for _________.

A

Machines

31
Q

In mechanical transmission, energy in the form of mechanical movement is transmitted and controlled through _____, ____, ____, ____, ____, and _____ to get the work done.

A

Levers, chains, pulleys, belts, cams, and gears.

32
Q

How are the functions of pneumatic and hydraulic systems the same as electrical and mechanical systems?

A

They all transit energy

33
Q

Electrical transmission in the form of _______ is transmitted and controlled through ______, to an _________ where the work is to be done.

A

Electricity, wire, and electrical actuator

34
Q

Pneumatic transmission in the form of _______ is transmitted and ______ through piping, to a _______ actuator where the work is done.

A

Compressed air flow, controlled, and pneumatic

The Physical World of a Machine (1 decks)

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