What’s the Unit?. Most physical quantities have units. You need to know the SI unit for each quantity you use.

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Presentation transcript:

What’s the Unit?

Most physical quantities have units. You need to know the SI unit for each quantity you use.

When we say physical “quantities”, we mean things like time, distance, area, density, etc.

When we say “units” we mean the standard amounts of each quantity. The standard amounts of time are seconds, minutes, etc…the units.

When we say SI we mean the main version of the metric system used in science. SI stands for International System. Another name for the SI is the “mks system”. mks stands for meters, kilograms, seconds.

You learn many units just by using them a lot. The ones you don’t know well you should memorize.

Here we go:

What’s the SI unit for distance? meter

Mass…what’s the SI unit? kilogram

The SI unit for time? second

Units for distance, mass, and time? meters, kilograms, and seconds

SI units for length? meter For width? meter For height? meter

For breadth, and depth? meter Any distance, in any direction, has meters as the SI unit.

displacement? meter

speed? meters per second velocity? meters per second

Acceleration? meters per second per second or, meters per second squared

Force? newtons

Friction force? newtons Coefficient of friction?? No units

Elastic force (spring force)? newtons Spring constant? newtons per meter

Tension force? newtons

Electric force? newtons

Gravitational force? newtons

Weight force? newtons. And “weight” is the same thing as gravitational force.

Energy? joules

Kinetic Energy? joules

Gravitational Potential Energy? joules

Elastic Potential Energy? joules

Work Energy? joules

Momentum? kilograms x meters per second

Impulse? kilograms x meters per second or, newtons x seconds

Electric Charge? coulombs

Electric Field? newtons per coulomb.

Magnetic Field? teslas.

Temperature? kelvin.

Electric Potential (a.k.a.Voltage)? volts

Electric Current? amperes (amps)

Electrical Resistance? ohms

Resistivity? ohms x meters

Frequency? hertz

Period? seconds

Power? watts

Area? meters squared, or square meters

Distance Displacement Height Length ______

Distance Displacement Height Length meters

Gravitational force (a.k.a.weight) Elastic force Friction force Normal force Tension force _______

Gravitational force (a.k.a.weight) Elastic force Friction force Normal force Tension force newtons

Kinetic energy Elastic potential energy Gravitational potential energy Internal energy Work _____

Kinetic energy Elastic potential energy Gravitational potential energy Internal energy Work joules

Momentum Impulse ________________________, or _____________.

Momentum Impulse Kilogram x meters per second, or newton seconds.

acceleration _________________________ or _____________________

acceleration meters per second per second or meters per second squared

That’s all for “What’s the Unit”.