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CPS ADV. - McQuaid > Unit 5 Review > Flashcards

Unit 5 Review Flashcards

1
Q

What is work?

A

force applied through a distance.

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2
Q

What two elements are required for work to be done?

A
  1. the applied force must make the object move
  2. the movement must be in the same direction as the applied force
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3
Q

True or False: If you push against a desk and nothing moves, you have done work.

A

False

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4
Q

Fill in the blank: Work requires both _______ and motion.

A

force

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5
Q

What is the formula for calculating work?

A

W = Fd

work (in joules) = applied force (in newtons) x distance (in meters)

W = Fd

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6
Q

True or false: Both work and energy are measured in joules.

A

True

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7
Q 
During the ascent phase of a rep of the bench press, the lifter exerts an average vertical force of 1000N against a barbell while the barbell moves 0.8 m upward.

How much work did the lifter do to the barbell?

A

800 J

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8
Q

The rate at which energy is transferred is also known as what?

A

power

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9
Q

How do you calculate power?

A

you divide the amount of work done by the time it takes to do that work

P = W / t

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10
Q

What unit is power measured in?

A

joules per second

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11
Q

True or false: One watt is equal to one joule per second.

A

True

This means that joules per second and watts can be used interchangeably.

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12
Q

Provide the definition of machine.

A

a device that changes the force or increases the motion from work

Window blinds are a machine that changes the direction of an input force
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13
Q

A simple machine is a machine that does work with only ____ movement of the machine.

A

one

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14
Q

List the six types of simple machines.

A
  1. Lever
  2. Pulley
  3. Wheel and axle
  4. Inclined plane
  5. Screw
  6. Wedge
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15
Q

True or false: The pulley and the wheel and axle are modified levers.

A

True

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16
Q

What two simple machines are modified inclined planes?

A
  1. Screw
  2. Wedge
17
Q

Provide the definition of efficiency.

A

a measure of how much of the work put into a machine is changed into useful output work by the machine

Simplified: how much input work is changed to output work

18
Q

True or false: Some machines are 100% efficient.

A

False

19
Q

True or false: Ideal machines1 are impossible to build.

1 | A machine that has 100% mechanical efficiency

A

True

20
Q

Why are ideal machines impossible to build?

A

Every machine has moving parts, and some use input work to overcome friction

21
Q

Provide the equation for efficiency.

A

e = Wout / Win * 100

Efficiency is usually expressed as a percentage

22
Q

List one way that machines can be made more efficient.

A

adding a lubricant

Some examples of lubricants are oil and grease.

23
Q

List the two forces involved when a machine is used to do work.

A
  1. Fin
  2. Fout

Fin - stands for the effort force
Fout - the force applied by the machine

24
Q

The ratio of the output force to the input force is also known as what?

A

mechanical advantage

MA = Fout / Fin

25
Q

True or false: Every change that occurs involves energy.

A

True

26
Q

Provide the definition of energy.

A

the ability to do work

27
Q

Provide the definition of a system.

A

Anything that you can imagine a boundary around.

A system can be a single object, such as a baseball, or a group of objects, such as the solar system.

28
Q

Provide the six different forms of energy.

A
  1. Electrical
  2. Chemical
  3. Radiant (light)
  4. Thermal
  5. Nuclear
  6. Sound

Any form of energy can be converted to another.

29
Q

The energy a moving object has because of its motion is also known as …

A

kinetic energy.

30
Q

The kinetic energy of a moving object depends on the object’s _____ and its ________.

A

mass, velocity (speed)

31
Q

Provide the kinetic energy equation.

A

KE = 1/2 mv2

32
Q

Provide the definition of potential energy.

A

the stored energy of position possessed by an object due to the interactions between another object

33
Q
A

CPS ADV. - McQuaid (5 decks)

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