Unit 1.1:Scalars,Vectors & Moments Flashcards

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1
Q

What is a scalar quantity?

A

A quantity which can be described fully by giving only its magnitude.

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2
Q

State 3 scalar quantities

A

Speed
Distance
Mass
Energy
Power
Temperature

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3
Q

What is a vector quantity?

A

A vector quantity has magnitude and direction

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4
Q

State 3 vector quantities

A

Velocity
Acceleration
Force
Displacement
Weight
Momentum

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5
Q

What is Displacement?

A

Displacement is the distance moved in a straight line, in a given direction, from the starting point.

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6
Q

What is a resultant vector?

A

A resultant vector arises from adding vectors together

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7
Q

What does resolving a vector mean

A

It means splitting a vector into two mutually perpendicular components that add up to the original vector; these can be added ‘tip to toe’

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8
Q
A
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9
Q

State the equation used to calculate a moment and the units used

A

moment=force x distance
Units:Newton meters (Nm)

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10
Q

What is a moment defined as

A

The product of force and the perpendicular distance between the line of action and the pivot

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11
Q

What are the 2 conditions needed for equilibrium?

A
  1. The resultant force is zero
  2. The net moment is zero
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12
Q

State the principle of moments

A

If an object is in equilibrium, the net moments about any pivot is equal to zero.

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13
Q

Define ‘Center of gravity’

A

It is a point which all the weight of an object is considered to act

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14
Q

Define density

A

The measure of how concentrated the mass is per unit volume

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15
Q

State the equation and the units for density

A

p=m/v
Units:kgm-3

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