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Engineering 11 > Unit 1 Revision > Flashcards

Unit 1 Revision Flashcards

1
Q

What is the x-component of a force?

A

F * cosθ

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2
Q

What is the y-component of a force?

A

F * sinθ

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3
Q

How do you calculate a force’s magnitude from its components?

A

√x^2 + y^2

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4
Q

How do you calculate a force’s angle from its components?

A

tan(y/x)

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5
Q

How do you calculate a moment?

A

M = F x d

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6
Q

What is a moment?

A

A moment is a turning effect on a body relative to a point, created by a perpendicular force.

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7
Q

What is gravity defined as?

A

9.8m/s^2

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8
Q

What is the difference between weight and mass?

A

Mass is how much matter in an object, weight is the force of gravity acting on that mass.

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9
Q

What is Newton’s first law?

A

An object will remain in its current state of motion unless an external force acts on it. Objects have inertia.

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10
Q

What is Newton’s second law?

A

F=ma

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11
Q

What is Newton’s third law?

A

Every action has an equal and opposite reaction.

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12
Q

How do you calculate density?

A

Divide mass by volume

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13
Q

What is density?

A

For a substance, how much mass there is within a set volume.

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14
Q

What is Archimedes’ principle?

A

The size of upthrust is equal to the weight of the water displaced.

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15
Q

What is the formula for upthrust?

A

Upthrust = density x volume x gravity

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16
Q

How do you find a zero force members?

A

If a joint has two non-colinear members, and the joint has no load or support reaction, these members are zero force members.

If a joint has two colinear members connected, and another member, then the non-colinear member is a zero force member, if the joint has no load or support reaction.

17
Q

Why are zero force members included?

A

To increase stability and rigidity of a truss.

18
Q

What are four main material classifications?

A

Metals, Ceramics, Polymers, Composites

19
Q

Metal Properties?

A

Malleable, Strong, Conductive

20
Q

Ceramic Properties?

A

Hard, Strong, Brittle

21
Q

Polymer Properites?

A

Low Density, Can be either flexible or hard, Insulating

22
Q

What are primary bonds?

A

Bonds that involve directly bonding between atoms and sharing electrons (ionic, covalent, metallic).

23
Q

What are secondary bonds?

A

Weaker bonds that hold together groups of molecules (i.e. van der waals forces)

24
Q

What are covalent bonds?

A

Bonds between non-metals. They share electrons between two atoms’ outer shells

25
Q

What are ionic bonds?

A

Bonds between metals and non-metals. They transfer electrons between outer shells are are then attracted together by electromagnetic force.

26
Q

What are metallic bonds?

A

Bonds between metals. They are bonded together by the ‘electron sea’ of disassociated electrons, which attracy the positive metal nuclei.

Engineering 11 (3 decks)

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