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UNIT D STUDY DECK Flashcards

1
Q

What is a simple machine

A

A tool or device made up of one basic machine

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2
Q

What are the 6 simple machines

A

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

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3
Q

What is an example of a lever

A

Scissors

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4
Q

What is an example of an inclined plane

A

A ramp

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5
Q

What is an example of a wheel and axle

A

Screwdriver

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6
Q

What is an example of a wedge

A

Axe

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7
Q

What is an example of a screw

A

Corkscrews

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8
Q

What is an example of a pulley

A

Window blinds

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9
Q

How many classes of levers is there

A

3

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10
Q

What are the 3 classes of levers

A

Class 1, class 2, class 3

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11
Q

How to tell if a lever is a class 1

A

The fulcrum is in the middle of the load and effort

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12
Q

How to tell if a lever is a class 2

A

The load is in the middle between the fulcrum and effort

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13
Q

How to tell if a lever is a class 3 lever

A

If the effort is in the middle between the fulcrum and load

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14
Q

Give 3 examples of a class 1 lever

A

Scissors, seesaw, crowbars

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15
Q

Give 3 examples of class 2 levers

A

Wheelbarrow, nutcracker, nail clippers

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16
Q

Give 3 examples of class 3 levers

A

Brooms, hockey stick, fishing rod

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17
Q

What is a complex machine

A

Devices made up of several simple machines working together

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18
Q

What are the 4 effects of simple machines

A

Change the direction of applied force

Multiply force

Increase or decrease speed

Transfer force

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19
Q

What is a system

A

is a group of parts that work together to perform a function

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20
Q

What is a subsytem

A

is a smaller group of parts that performs a specific function within a complex machine

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21
Q

What are the 2 systems that transfer forces

A

Linkages and transmissions

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22
Q

What is a linkage

A

A belt or chain used to transfer energy

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23
Q

What is an example of a subsystem

A

Engine in a vehicle

24
Q

What is an example of a system

25
When one wheel turns___________.
The other will turn in the same direction
26
What is a transmission
A type of linkage used for heavier loads
27
What is the gear that has the force applied
The driving gear
28
What is the force that is applied from the driving gear called
The driven gear
29
What are the options of transmissions
Move the object slowly with a big force Move the object faster with a smaller force.
30
What is a gear train
A set of 2 or more gears in rotation
31
The smaller the gear, the faster it will go
True
32
What is the difference between the multiplying gear and the reducing gear
The multiplying gear increases speed while the reducing gear decreases speed
33
Mechanical Advantage meaning
The amount in which the MACHINE can multiply a force
34
What is the INPUT force
The force you apply
35
What is the OUTPUT force
The force the machine applies
36
Speed ratio meaning
A measure of how the speed of the object is affected by a machine
37
True or false: The input and output for speed ratio is called the input and output distance
True
38
Can you have a mechanical Advantage less than 1
Yes It means that the machine is better for speed, not force
39
What will not be affected when friction if involved
Speed ratio
40
What does it mean when someone says 'ideal situation' in science
A frictionless world
41
What is efficiency
is a measure of how well a machine or a device uses energy
42
What happens when work is done
A force acts upon an object to make it move
43
Without energy there is no ______
work
44
What do simple machines do
The decrease the amount of effort
45
What do simple machines NOT do
Decrease the amount of work
46
What is a hydraulic system
Uses liquids under pressure to move loads
47
What is pascal's law
Pressure is all the same in an enclosed fluid
48
On a piston, pressure exerts on the _______________
Output piston
49
On a piston, the input piston is used to apply ________
Force
50
What are some of the criteria people use to evaluate a machine
Use Aesthetics Purpose Cost Workmanship Reputation
51
What is the tradeoff
Force for distance
52
What is efficacy
How quickly a device does it's task
53
What is effectively
How well a machine does it's job
54
What must a design do
Fit the function
55
What is a function
What the device is supposed to do
56
What is a design
The form that the machine has to make is usable
57
What are the 2 questions you ask when evaluating
How can we improve it How can we make it better for the environment

Science Study Decks (12 decks)

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