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Ligma > levers > Flashcards

levers Flashcards

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1
Q

Levers definition

A

are bar like objects that turn around a fixed point, and force are applied to two other points on the object

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2
Q

3 main part of a lever

A

Resistance, axis and force

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3
Q

how to create arf fro garf

A

arf down the middle, arf across the middle

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4
Q

Resistance

A

is the weight to be moved

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5
Q

Axis

A

is the pivot point

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6
Q

Force

A

is the application point to move the resistance

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7
Q

1st class+eg

A

have their axis between the resistance and force eg: see saw

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8
Q

Second class lever + eg

A

have their axis at the end of the lever with the resistance between the axis and the force, eg: wheelbarrow

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9
Q

Third class levers+ eg

A

have their axis at the end of the lever with the force in between the axis and resistance eg carrying a load on a shovel

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10
Q

force arm

A

is the distance from the force to the axis of the lever

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11
Q

resistance arn

A

distance from the resistance to the axis of the lever

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12
Q

Input force

A

is the force exerted on the lever

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13
Q

output force

A

is the force (resistance) exerted by the lever

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14
Q

How to increase application of force/strength

A

make the force arm longer than the resistance arm

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15
Q

how to increase speed

A

make the force arm shorter than the resistance arm

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16
Q

Levers in the human body

A

few examples of first and second class, most levers in the body are 3rd class

17
Q

Why are 3rd class levers the most common

A

as we are mechanically built for speed and and 3rd class levers mean their is a large resistance arm

18
Q

3 factors affecting use of levers

A

length
inertia
force

19
Q

Length

A

The longer a lever, the greater the velocity at the end of the leaver

20
Q

Inertia

A

The longer/heavier a lever, the harder it is to rotate

21
Q

force

A

the amount of force an athlete can generate via their muscles determines what length of lever they should use

Ligma (19 decks)

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