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GCSE DT > Mechanical components and devices > Flashcards

Mechanical components and devices Flashcards

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1
Q

Rotational Speed =

A

Rotational Speed = number of revs/time

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2
Q

Linear Speed =

A

Linear Speed = distance/time

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3
Q

What is a mechanism?

A

They can increase force and reduce distance
OR
increase distance and reduce force
think of moments in physics

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4
Q

Examples of mechanisms are …..

A 
levers
linkages
pulleys
cams
gears
rack and pinion
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5
Q

Describe a lever

A 
Levers have:
a fulcrum (pivot)
a input force (the effort)
an output force (the load)
They rely are the principle of moments
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6
Q

What is rotational motion?

A

Movement in a circle

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7
Q

What is linear motion?

A

Movement in a straight line

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8
Q

What is reciprocating motion?

A

Movement back and forth in a straight line

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9
Q

What is oscillating motion?

A

Constant movement from side to side along a curved path

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10
Q

What are the different types of Linkage?

A
  • Pulleys (Linear to Linear in opposite directions)
  • Gear systems (Rotary into Rotary)
  • Rack and pinion (Rotary into Linear)
  • cams (Rotary to Reciprocating)
  • bell crank (transfers motion round a corner)
  • peg and slot (rotary to oscillating)
  • crank and slider (rotary to reciprocating)
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11
Q

What is the mechanical advantage equation?

A
  • MA=Load/Effort
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12
Q

Why do we use levers?

A
  • To gain mechanical advantage

- This makes lifting something easier

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13
Q

What is the moments equation?

A

F1 D1 = F2 D2

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14
Q

What is a class 1 lever?

A
  • A seesaw
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15
Q

What is a class 2 lever?

A
  • A wheelbarrow
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16
Q

What is a class 3 lever?

A
  • Tweezers
17
Q

What is the principle of a mechanical device?

A
  • To transform input motion and force into desired output motion and force
18
Q

What are the 4 types of motion?

A

linear motion - in a straight line m/s
rotary motion - in a circle revs/sec
reciprocating motion - in oscillations per second eg piston in a car engine
oscillating motion - in oscillations per second eg pendulum

19
Q

What is a linkage?

A

component which directs forces and movement to where they are needed

GCSE DT (12 decks)

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