Do Now: What are some units you can think of? (THINK PAIR SHARE) COME UP WITH 5 DIFFERENT

UNITS AND THINK FOR WHAT ARE THEY USED. FOR MASS FOR LENGTH FOR TIME

FOR AREA FOR VOLUME OTHER UNITS

Aim: Why are units so important?

EQ: What is essential to Succeed in physics class?

The seven SI base units

The kilogram (kg) - unit of measurement of mass. The meter (m) - unit of measurement of length. The second (s) - unit of measurement of time. The kelvin (K) - unit of measurement of thermodynamic temperature. The ampere (A) - unit of measurement of electric current. The Joule (J) – unit of electrical potential energy The mole (mol) - unit of measurement of amount of substance The candela (cd) - unit of measurement of luminous intensity

Consider this: What unit would you use?

To measure the distance between your house and the school in? (m)

To measure the time interval it takes for a cake to bake?

To measure the mass of the grocery bag your mom just asked you to carry?

Some Examples of SI derived units expressed in terms of base unitsDerived Quantity SI derived unit

  Name Symbolarea square metre m2

volume cubic metre m3

speed, velocity metre per second m/s

acceleration metre per second squared m/s2

Force 1 Newton Kgm/s2

density, mass density kilogram per cubic metre kg/m3

current density ampere per square metre A/m2

magnetic field strength ampere per metre A/m

Power Watt J/s

http://www.npl.co.uk/

Consider this: What unit would you use?

To measure how fast are you driving? (m/s) To measure how much faster you need to go in order

to pass the car next to you? To measure the force you need to move your

furniture? To measure how big the base of the object above

your table is? How about the size of the full object?

Prefixes for Powers of 10Prefix Symbol Notation

tera T 1012

giga G 109

mega M 106

kilo k 103

deci d 10–1

centi c 10–2

milli m 10–3

micro µ 10–6

nano n10–9

pico p 10–12

Consider this: What unit would you use?

To measure the size of a microbe? (nm) To measure the mass of your morning coffee?

(g) To measure how fast the train is traveling on

average? (Km/hr)

Try these: What unit would you use?

To measure how tall your finger is? To measure the width of your finger? To measure how high the ceiling is? To measure the distance between your house

and the school in?

What is meant by precision?

How precise is the measurement? Depends on the equipment you use.The last digit is estimated.

Measurement Activity. (Start of LAB)

Measure objects around you, including the ones the teacher tells you to, and be ready to share your results.