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Physics problems: units

 

Anytime when we solve physics problems we need to use all the variables in the same system of units.

It is more convenien to use International System of Units (SI units).

When you solve physics problems: remember to check the units before you substitute all the numbers into the equations.

All variables should be in SI units.

 

International System of Units (SI):

 

Base Units

length

meter (m)

mass

kilogram (kg)

time

second (s)

electric current

ampere (A)

temperature

kelvin (K)

 

Other Units

velocity

meter per second, m/s

acceleration

meter per second squared,

force

newton,

pressure

pascal,

energy

joule,

power

watt,

electric charge

coulomb,

electric potential

volt,

capacitance

farad,

electic resistance

ohm,

inductance

henry,

 

Unit Conversion:

1 mile = 1609.344 meter (m)

1 meter (m) = 0.0006214 mile

1 inch (in) = 0.0254 meter (m)

1 meter (m) = 39.37 inch (in)

1 foot (ft) = 12 inch (in)

1 inch = 0.083 foot (ft)

1 foot (ft) = 0.3048 meter (m)

1 meter (m) = 3.28 foot (ft)

1 meter/second (m/s) =

.................3.6 kilometer/hour (km/h)

1 kilometer/hour (km/h) =

................0.2778 meter/second (m/s)

1 mile/hour (mph) =

..........................0.447 meter/second (m/s)

1 meter/second (m/s) =

.............2.24 mile/hour (mph)

1 kilogram (kg) = 2.2046 pound (lb)

1 pound (lb) = 0.4536 kilogram (kg)

Temperature

T (Kelvin) = T (Celsius) + 272.15

T (Celsius) = T (Kelvin) - 272.15

T (Celsius) = (5/9)* [ T (Fahrenheit) - 32 ]

T (Fahrenheit) = (9/5)* T (Celsius) + 32

 

You can find more unit conversion here:

 

www.unit-conversion.info

Unit Converter  

 

Here you can find the physics problems on unit conversion: Problems.

 

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