mechanics Flashcards

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1
Q

what is a vector

A

a physical quantity which has both magnitude and direction

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2
Q

what is a scalar

A

a physical quantity which has magnitude only

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3
Q

what is a bearing

A

measured clockwise from north

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4
Q

what is a resultant

A

is the single vector that has the same effect as all the component vectors together would have

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5
Q

what is the maximum resultant

A

1)it is obtained when two vectors act in the same direction.
2)the angle between them is 0 degrees.
3)the resultant sum is then the sum of the magnitudes of the two vectors.

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6
Q

what is the minimum resultant

A

1) is obtained when two vectors act in the opposite direction
2) the angle between them is 180 degrees
3)the resultant is then the difference of the magnitudes of the vectors

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7
Q

what is position (x)
the SI unit for position

A

the reference point
m

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8
Q

what is distance (d)
SI unit for distance

A

distance from one position to another is the length of the path actually taken
m

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9
Q

what is displacement (Δx)
SI unit for displacement

A

displacement is a body’s change of position
m

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10
Q

what is speed (v)
SI unit for speed

A

is the rate of change of distance moved
m.s-1 or m/s

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11
Q

what is instantaneous speed

A

instantaneous speed is the speed at a particular moment

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11
Q

what is instantaneous speed

A

instantaneous speed is the speed at a particular moment

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12
Q

what is velocity (v)
SI unit for velocity

A

the rate of change of position
m.s-1 or m/s

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13
Q

what is instantaneous velocity

A

the velocity at a particular moment

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14
Q

how do we convert km.h-1 to m.s-1

A

divide 3,6

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15
Q

what is acceleration (a)
SI unit for acceleration

A

the rate of change of velocity.

m.s-2

16
Q

what scalar quantities

A

Distance
Mass
Speed
Time

17
Q

what is a vector quantity

A

Displacement
Weights
Velocity
Acceleration

18
Q

draw a basic Position vs Time graph pg121

A
19
Q

draw a positive acceleration graph pg121
what does it mean

A

it means that the velocity is increasing

20
Q

draw a negative acceleration graph pg121
what does it mean

A

it means that the velocity is decreasing

21
Q

draw a basic Velocity vs Time graph pg123
-explain the increasing decreasing of velocity

A

positive velocity -the gradient increases
negative velocity- the gradient decreases