Inertia and mass

Inertia and massPlease begin your bellwork

Thanks!

0Bellwork: pick up the workbook and get out your notebook0Write your name in your

WORKBOOK.

Main objective for today:

0Understanding the relationship between inertia, mass AND weight

Inertia

0Inertia : the resistance an object has to a change in its state of motion

What does state of motion mean?

0This is defined by its velocity – the speed with a direction. 0Thus inertia could be redefined as follows:

0Inertia: tendency of an object to resist changes in its velocity.

0So… an object at rest has ______ velocity0And in the absence of an unbalanced force, it will __________ with a

________ velocity.0An object in motion with a velocity of 2 m/s East will (in the

absence of an unbalanced force)remain in motion with a velocity of 2 m/s, East

0AND if an object is not changing its velocity, then it is said to have no __________________.0 Inertia: tendency of an object to resist accelerations.

Mass as a measure of the Amount of Inertia

0Mass is that quantity that is solely dependent upon the inertia of an object.0The tendency of an object to resist

changes in its state of motion varies with mass.

WEIGHT

0= the force of gravity0=mass x 9.8m/s²0Measured in Newtons (mass is

measured in kg)

Convert your weight to newtons

01kg = 2.2 lb

Inertia lab

0Conduct the lab and explain each in your notebook.

0Paper ring/penny0Paper under beaker0Candy inertia

0A more massive object has a greater tendency to resist changes in its state of motion.

02 brick example. How could we determine the lighter brick

0Give them an identical push. The brick that offers the least resistance is the brick with the least inertia – and therefore the brick with the least mass.

Newton’s first law

0Sometimes referred to as the law of inertia0Official: An object at rest and an object

in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.0Write your own definition…

Mr. Rouk’s version

0“Stuff likes to keep doin what it’s doin.”

Epic inertia demo

0 ‘smash brick on hand’

0End 10-4-13