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Engineering 👷🏼‍♀️ > Topic 1 > Flashcards

Topic 1 Flashcards

1
Q

What is a simple machine?

A

A mechanical device that can transmit, change magnitude or direction of a force

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2
Q

What are the 6 simple machines?

A
  • lever
  • wheel and axle
  • pulley
  • inclined plane
  • wedge
  • screw
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3
Q

What is a basic machine?

A

a modified simple machine or a machine using only several simple machines

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4
Q

What is linear motion?

A

motion in a straight line in a horizontal or vertical direction

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5
Q

What is rotary motion?

A

motion in a continuously circular path that is about an axis

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6
Q

What is oscillatory motion?

A

repeated motion where the same movement is repeated

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7
Q

What is reciprocal motion?

A

repetitive back and forth or up and down linear motion

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8
Q

What is using motion?

A

utilises various types of motion

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9
Q

What is the motion of a rocking chair?

A

oscillating

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10
Q

what is the motion of a gear?

A

rotary

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11
Q

What is the motion of a saw?

A

reciprocal

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12
Q

What is Mechanical Advantage?

A

The ratio of the force produced by a machine to the force applied to it

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13
Q

What is Velocity Ratio?

A

The ratio of the distance moved by effort to the distance moved by the load in a simple machine.

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14
Q

What is efficiency?

A

The measure of how much work goes into moving something compared to mechanical advantage.

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15
Q

If the input force is 80N and the output force is 160N. Calculate mechanical advantage

A

2

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16
Q

if something moves 200mm when the effort moves 600mm. Calculate velocity ratio

A

3

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17
Q

What is a first order lever?

A

the fulcrum is between the effort and the load

18
Q

What is a second order lever?

A

the load is between the fulcrum and the effort

19
Q

What is a third order lever?

A

the effort is between the load and the fulcrum

20
Q

Is a driver gear the effort or load?

A

effort

21
Q

Is a driven gear effort or load?

A

load

22
Q

What are three types of gears?

A
  • spur
  • worm and worm gear
  • rack and pinion
23
Q

How do you calculate the VR of a spur gear?

A

number of teeth on driven/number of teeth on driver

24
Q

How do you calculate the VR of a worm gear?

A

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

25
Q

How do you calculate the VR (gear ratio) of a rack and pinion?

A

number of teeth on pinion x number of teeth on rack

26
Q

What is the VR of a pulley system?

A

number of ropes supporting the load

27
Q

what is work?

A

the energy transferred to or from an object via the application of force along a displacement.

28
Q

What is the SI unit of work?

A

Joules

28
Q

What is energy?

A

the ability/capacity to do work

29
Q

what is kinetic energy?

A

the energy that an object possesses due to its motion

30
Q

what is potential energy?

A

the energy that an object possesses because of its position in a gravitational field

31
Q

what is mechanical energy?

A

the sum of the kinetic and potential energy of an object that is used to do work

32
Q

What is power?

A

the rate of energy consumption over time/rate of doing work

33
Q

What is power measured in?

A

Watts

34
Q

what is energy consumption measured in?

A

1 joule per second (J/s)

35
Q

What is displacement?

A

change in the position of an object, along a straight line

36
Q

What is friction?

A

a force that opposes motion or impending motion

37
Q

Does a low or high coefficient of friction allow an object to move more easily?

A

low

38
Q

how can you find the MA of an inclined plane?

A

MA= incline length/incline height

39
Q

what is a formula for efficiency?

A

output power/input power

Engineering 👷🏼‍♀️ (4 decks)

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