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Science > Chapter 4 > Flashcards

Chapter 4 Flashcards

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0
Q

What is the formula for power

A

Work divided time

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1
Q

What is the formula for work

A

Force times distance

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2
Q

What is power measured

A

Watts

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3
Q

What is force measured

A

Joules

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4
Q

What is the definition of work

A

When a force causes an object to move in the direction of the force

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5
Q

Is pushing as stalled car work. Why

A

No because the cat isnt moving

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6
Q

If you pick a suitcase up and move forward is it work? Why?

A

No because the suitcase isn’t going in the same direction as the force

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7
Q

Where r u doing more work

1) lifting a 80N barbell
2) lifting a 160N barbell

A

You don’t know until you know how high each one is lifted

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8
Q

What is the definiton of power

A

Rate at which work is done

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9
Q

Machine defition

A

Device that makes work easier by changing the size and direction

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10
Q

Input force

A

The force you apply

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11
Q

Output force

A

The work the machine applies

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12
Q

Can work out put ever be greater then work input

A

No

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13
Q

What is mechanical advantage

A

How many times a machine multiplies your force

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14
Q

Do machines save work

A

No

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15
Q

What do machines change

A

Size of force and distance

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16
Q

With a machine increases the force what happens to the distance

A

It decreases

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17
Q

When machines change the direction of the force what is the mechanical advantage

A

1

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18
Q

What is the mechanical advantage of a machine that has a greater input force

A

Less than 1

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19
Q

Why is work output of a machine always less then the work input

A

Because if friction so the machine loses work

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20
Q

Mechanical efficency

A

Comparison of machines work output with the work input

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21
Q

What is the equation for mechanical efficiency

A

Work output divided by work input times hundred

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22
Q

Ideal machine

A

A machine with 100 percent efficency

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23
Q

What are the six simple machine

A

Lever, incline plane, wedge, screw, wheel and axle, and pulley

24
Q

Lever

A

Simple machine consisting of a bar that pivots at a fixed point called a fulcrum

25
Q

What are levers used for

A

Apply force to the load

26
Q

First class lever

A

The fulcrum is between the input force and the load

27
Q

What do first class levers fo

A

Change the direction of the input force

28
Q

List one example of a first class lever

A

Teeter totter

29
Q

Second class lever

A

Load is between the fulcrum and input force

30
Q

How do second class levers help

A

Allow you to apply less force then the force exerted by the load

31
Q

Third class lever

A

The input force is between the fulcrum and load

32
Q

What do third class levers do

A

They don’t increase input force

33
Q

Mechanical advantage of a first class lever

A

Greater then one

34
Q

Whatis the mechanical advantage of a second-class lever

A

Greater than one

35
Q

What is the mechanical advantage of a third class lever

A

Less than one

36
Q

Incline plane

A

A straight slanted surface

37
Q

How are inclined planes helpful

A

requires a smaller input force

38
Q

What happens the distance with an inclined plane

A

The distance increases

39
Q

Mechanical advantage of incline plane

A

The longer the inclined plane is compared with its height the greater the mechanical advantage

40
Q

How do you calculate the mechanical advantage of an inclined plane

A

Divided length by height

41
Q

wedge

A

Double inclined plane that moves

42
Q

How are wedges helpful

A

Which is applying an output force that is greater then your input force

43
Q

What happens to the distance with the wedge

A

It increases

44
Q

Example of wedge

A

Knife

45
Q

Mechanical advantage of wedge

A

The longer and thinner the wedge is the greater the mechanical advantage

46
Q

How do you calculate the mechanical advantage of the wedge

A

Length divided by thickness

47
Q

Screw

A

Incline plane wrapped in a spiral

48
Q

Mechanical advantage of screwa

A

The longer the incline plane the greater the mechanical advantage and when u straighten it out it is a really long incline plane

49
Q

Wheel and axle

A

Simple machine consisting of two circular objects of two different sizes

50
Q

What is bigger wheel or axle

A

Wheel

51
Q

Mechanical advantage if wheel and axle

A

Can be determined by dividing the radius of the wheel by the radius of the axle and turning the wheel makes a mechanical advantage of greater than one

52
Q

Pulley

A

Grooved wheel that holds a rope or a cable

53
Q

Fix pulley

A

Doesnt increase force

54
Q

Movable pulley

A

Doesn’t change forces direction and you have to make both sides move

55
Q

Block and tackles

A

Fixed pulley and moveable pulley together can have large mechanical advantage when several pulleys are used

56
Q

Compound machines

A

Made of two or more compound machines

57
Q

Some examples of compound machines

A

Block and tackle, scissors, and zipper

58
Q

Mechanical efficiency of a compound machine

A

Mechanical efficiency of compound machine is low because the more moving parts a machine has the less mechanical efficiency and friction should be reduced as much as possible

Science (7 decks)

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