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Gcse technology > Mechanicla Devices > Flashcards

Mechanicla Devices Flashcards

1
Q

Wha tisnlinear move.ent

A

Movement in a straight line

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2
Q

What is reciprocating movement

A

Movement back and forth

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3
Q

What is rotary movement

A

Movement on or around an axis

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4
Q
A
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5
Q

What is oscillating movment

A

Back and forth movement on a curve

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6
Q
A
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7
Q

What is the purpose of a lever

A

Gain mechanical advantage

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8
Q
A
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9
Q

What is the fulcrum

A

Point around which a lever turns - pivot

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10
Q

What is effort

A

The input force

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11
Q

What is load

A

The output.force.from a lever

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12
Q

How do you.calculate.the mechanical advsntage

A

MA = load/effort

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13
Q

What is a first order lever

A

Has the fulcrum between load and effort - see saw

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14
Q

What is Second order lever

A

Wheelbarrow effort at one end fulcrum at other load somewhere I the middle

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15
Q

What is a third order lever

A

Bbq tongs load is at one end fulcrum.at the other amd effort applied in middle

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16
Q

What is a push pull linkage

A

Maintains direction

17
Q

What is a bell crank linkage

A

Changes direction of motion through 90 degrees

18
Q
A
19
Q

What is a cam used for?

A

To turn rotary motion into reciprocating motion

20
Q
A
21
Q

How does a cam work?

A

As the cam rotates it pushes up a follower

22
Q

Give examples.of.different types of cams

A
23
Q

If I wanted to make a crank easier to turn what would I do

A

Move the handle.further away from the pivot

24
Q

Wear ate gears

A

A rotational linkage made up.of toothed wheels

25
Q

What is the drive gear

A

The input gear

26
Q

What is the driven gear

A

The output gear

27
Q

What is the purpose of an idelr gear

A

Is used to change the direction so that the drive gear and and driven gear rotate the same way

28
Q

What is the gear ratio

A

Drive ration = teeth on driven gear/teeth on drive gear

29
Q

How do you calculate the velocity ratio

A

Velocity ratio = drive gear / driven gear

Gcse technology (10 decks)

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