Physics 1 (lecture 1)

What is physics?

The science of studying the world around us and how it works

____ and ____ come from measurements

Laws

equations

What are the 2 systems of measurements?

• Metric system (international)

• B.S British system

What are the based measurements?

• length

• Mass

• Time

Metric system form Lenght ?

Meter (m)

Metric system from Time?

Second (s)

Metric system from mass?

Kilogram (kg)

British system for leght?

feet (ft)

British system from time?

Second (s)

British system for Mass?

Slug

What is a metter?

The distance light travels in 1/ 3×10³

light in travels @ _ M/S

• vacuum

• 3×10³

What is a second?

The duration of 9,192,631,770 periods of the vibration of the light emitted by calcium cesium-133 atom @ a specific wavelength

What is a Kg

A block of material in a museum in France which says 1Kg

Tetra

• T

• 10^12

Giga

• G

• 10^9

Mega

• M

• 10^6

Kilo

• K

• 10³

Deci

• d

• 10^-1

Centi

• c

• 10^-2

Milli

• m

• 10^-3

Micro

• µ

• 10^-6

nano

• n

• 10^-9

Angstrom

• Å

• 10^-10

Pico

• P

• 10^-12

Fermto

• f

• 10^-15

What is a femtometer

dimension of a nucleus