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Physics > Physical Quantities Units And Measurements > Flashcards

Physical Quantities Units And Measurements Flashcards

1
Q

What does SI unit stand for

And mean

A

The Système International d’Unitès is a system of metric units now used in many countries

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2
Q

The unit of length is….

A

Metre

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3
Q

What is length

A

Length is the distance travelled by light in a vacuum during a specific time interval.

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4
Q

What is volume?

A

The amount of small occupied

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5
Q

What is the unit of volume ?

A

Cubic centimetres

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6
Q

What is mass?

A

the measure of the amount of matter in a body.

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7
Q

What is the unit of mass ?

A

Kilograms

Kg

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8
Q

What is the unit of time ?

A

Second

s

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9
Q

What is time ?

A

the progression of events from the past to the present into the future.

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10
Q

Scalar quantities have …

A

Magnitude and units only

E.g distance

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11
Q

Vector quantities have

A

Both the magnitude and direction

E.g displacement

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12
Q

What is speed ?

A

The distance travelled per unit time

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13
Q

Average speed =

A

Distance move/time taken

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14
Q

Speed = distance / time

What is the SI unit of Speed?

A

m/s

ms-1

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15
Q

What is velocity ?

A

The rate of change of displacement

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16
Q

What is the SI unit of velocity

A

m/s

Metres per second

17
Q

What is displacement ?

A

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

18
Q

What is the SI unit of displacement ?

A

Metre

M

19
Q

Velocity =

A

Distance moved in a stated direction / time taken

20
Q

Velocity =

A

Displacement / time taken

21
Q

What is acceleration ?

A

It is the average of velocity / time taken

22
Q

What is the SI unit of acceleration?

A

metres/second2(m/s2)

23
Q

What is deceleration?

A

,a decrease in speed as the body moves away from the starting pointis defined as Deceleration. Deceleration is the opposite of acceleration. It is expressed as. Deceleration also is known as negative acceleration.
m/s²

24
Q

What is the name of the graph obtained if velocity of a body is plotted against the time ?

A

Velocity time graph

25
Q

What is a distance time graph ?

A

A distance-time graphshows how the distance and speed of an object changes with time

Physics (1 decks)

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