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easier textiles flashcards > mechanical devices > Flashcards

mechanical devices Flashcards

1
Q

motion in a straight line:

A

linear

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2
Q

motion in a circular motion

A

rotary

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3
Q

backwards and forwards motion:

A

reciprocating

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4
Q

a swinging motion backwards and forwards

A

oscilating motion

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5
Q

what is a mechanism?

A

device that changes an input into an output motion

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6
Q

what is a lever?

A

a mechanism which creates movement around a fixed point and makes lifting something easier

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7
Q

what are the three types of levers?

A

-reverse motion linkage
-parrallel motion linkage
-bell crank linkage

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8
Q

what is mechanical advantage?

A

where the force that comes out is more than the force that is put in.

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9
Q

what are the two parts of a lever?

A

a fulcrum and a bar

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10
Q

what are the three factors to consider when using a lever?

A

The effort: the force that is input.

The load: the force that is output.

Position of the fulcrum (pivot).

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11
Q

first order lever

A

Elephant
Fanny
Laughed

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12
Q

second order lever

A

Elephant
Larry
Farted

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13
Q

third order lever:

A

Fredrick
Elephant
Laughed

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14
Q

what can the first order lever be used for?

A

crow bar

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15
Q

What can the second order lever be used for?

A

wheelbarrow

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16
Q

what can the third order lever be used for?

A

tweesers

17
Q

what do cams and followers do?

A

change a rotary motion into a reciprocating motion

18
Q

what are the 4 types of cams?

A

-eccentric cam
-pear cam
-snail cam
-heart-shaped cam

19
Q

what are the 3 different types of followers?

A

-knife edged
-flat follower
-roller follower

20
Q

what are the properties of knife edged followers?

A

Good for precision.
Not good for heavy loads.
Low friction - however tip wears easily.

21
Q

what are the properties of flat followers?

A

Not good for precision.
Good for heavy loads.
Large flat surface creates friction.

22
Q

what are the properties of a roller follower?

A

Some precision.
Good for heavy loads.
Roller rotates reducing friction.

23
Q

what are gears?

A

wheels which interlock to move the force. different sized gears increase and decrease the speed they turn

24
Q

what is a pulley system used for?

A

used to change the speed, direction and/or power of the output motion.

25
Q

what can a simple pulley system be used for?

A

to lift heavy loads

easier textiles flashcards (32 decks)

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