Chapter 1- Units Flashcards by Tallulah Bannerman

Q

All measurements in physics are described as

A

Physical quantities

Eg
Mass, length, time, temp, current, amount of a substance, luminous intensity

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Q

All other measurements are derived from these

A

Base qualities

Eg
Speed (distance/time)

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Q

What must always be paired with a measurement?

A

A quantity

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Q

Base units are termed

A

SI units (system of international units)

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Q

Length

A

Metre m

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Q

Mass

A

Kilo gram kg

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Q

Time

A

Second s

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Q

Current

A

Ampere A

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Q

Temperature interval

A

Kelvin K

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Q

Amount of substance

A

Mole mol

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Q

Derived units

A

For physical quantities derived from two or more base quantities

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Q

Speed

A

Distance/ time

M/s

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Q

Acceleration

A

^velocity/ ^time

M/s^2

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Q

Force

A

Mass x acc

Newton
Kg m/s^2

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Q

Pressure

A

Force/ cross sectional area

Pascal

Kg/m/s^2

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Q

Work

A

W=Fx x

Joules

Q

Power

A

Work/ time

Watt (W)

Q

Charge

A

Current x time

Coulomb (C)

Q

Potential difference

A

Work / charge

Volt (V)

Q

Resistance

A

Velocity / current

Ohm (_/-_)

Q

Prefixes

A

For smaller or larger numbers

Eg micro milli

Q

Micro

A

X10-6

Q

Kilo

A

X10^3

Q

Milli

A

X10^-3

Q

Mega

A

X10^6

Q

Scalar

A

Magnitude only

Q

Vector

A

Magnitude and direction

Q

Adding scalars

A

Use normal maths

Q

Adding vectors

A

Use -ve and +ve for directions

Can use scale drawings

Q

When adding components in a vector triangle

A

Use trigonometry

Q

Trig for sin

A

Sin(*) = opposite/ hypotenuse

sOh

Q

Trig for cos

A

Cos(*)= adjacent/ hypotenuse

cAh

Q

Trig tan rule

A

Tan(*)=opposite/ adjacent

tOa

Q

Units

A

The actual units

Eg s,kg,m

Q

Quantities

A

The names of the things

Length, weight

Q

Speed SI

A

ms^-1

Q

Acceleration SI

A

ms^-2

Q

Force SI

A

kg ms^-1