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engineering qce ea > Topic 1: Statics > Flashcards

Topic 1: Statics Flashcards

1
Q

Crow bar

A

First-class lever, iron/steel bar used to wedge under an object to move or lift it

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2
Q

Bicycle

A

simple machine made of several components: axial, spoke, gear chain, crankshaft, pedals, vehicle used for transportation

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3
Q

Car jack

A

simple machine used as a lifting device

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4
Q

Linear motion

A

motion in a straight line

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5
Q

Rotary motion

A

motion in a circular path, motion about an axis

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6
Q

Oscillatory motion

A

motion that an object repeats continuously

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7
Q

Reciprocal motion

A

repetitive back-and-forth linear motion

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8
Q

Mechanical Advantage

A

MA=load/effort

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9
Q

Velocity Ratio

A

VR=distance moved by effort/distance moved by load

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10
Q

Efficiency

A

efficiency= MA/VR x100%

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11
Q

First class lever

A

Load-Fulcrum-Effort

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12
Q

Second class lever

A

Fulcrum-Load-Effort

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13
Q

Third class lever

A

Load-Effort-Fulcrum

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14
Q

Mechanical Advantage of Levers

A

MA=Load/Effort=distance to effort/distance to load

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15
Q

Velocity Ratio of Levers

A

VR=distance to effort/distance to load

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16
Q

Reducing Gears

A

the driver gear is smaller than the driven gear. Acts as a force multiplier but reduces speed

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17
Q

Multiplying Gears

A

the driver gear is bigger than the driven gear. Acts as a speed multiplier

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18
Q

Velocity ratio of Gears

A

VR=rpm of driver/ rpm of driven

19
Q

Gear ratio of Gears

A

GR=driven/driver

20
Q

Mechanical advantage of Gears

A

MA=GR

21
Q

Efficiency of Gears

A

MA/VR or GR/VR

22
Q

Velocity Ratio of Worm drives

A

VR=number of teeth on worm gear/threads on worm

23
Q

Gear ratio of Rack and pinion

A

GR= pinion teeth/rack pitch

24
Q

Mechanical Advantage of Inclined Planes

A

MA= load/effort

25
Q

Velocity Ratio of Inclined Planes

A

VR=distance moved by effort (along plane)/distance moved by load (vertically up) = 1/sinx

26
Q

Mechanical Advantage of Screws

A

MA= load/effort

27
Q

Velocity ratio of Screws

A

VR= distance moved by effort/ distance mover by load= circumference/pitch

28
Q

Pulleys

A

used to transmit power, change direction of force, provide assistance using MA

29
Q

Velocity Ratio of First-order pulley system

A

VR=2^p, p=movable pulleys in system

30
Q

Velocity Ratio of Second-order pulley system

A

VR=n, n= number of rops supporting lower pulleys

31
Q

Mechanical Advantage of pulleys

A

efficiency x n or efficiency x 2^p

32
Q

Work

A

W=Fd=Fdcosx=area under a force-displacement graph

33
Q

Power

A

P=W/t=E/t=Fd/t

34
Q

Potential Energy

A

PE=mgh

35
Q

Kinetic Energy

A

KE=1/2*mv^2

36
Q

Energy Efficiency

A

efficiency= useful output/input

37
Q

Linear Motion

A

v=u+ at, v^2=u^2+as, s=ut+1/2*at^2, average velocity=s/t

38
Q

Friction

A

force that opposes the motion of an object

39
Q

Static Friction Force

A

force that keeps object at rest/just at the point of moving, F=coefficient of static friction x normal force

40
Q

Kinetic Friction Force

A

force when there is relative motion.
F=coefficient of kinetic friction x normal force

41
Q

coefficient of friction

A

coefficient of friction= friction force/normal force = tanx

42
Q

limiting friction

A

frictional resistance that exists just as motion is about to occur

43
Q

Angle of static friction (phi)

A

angle between resultant reaction and normal reaction

44
Q

Angle of repose (theta)

A

angle of the inclined plane

engineering qce ea (3 decks)

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