March 31, 2014

Homework: Continue working on Force Packet,

pages 1-4 are due tomorrow for check-in

Do Now: Write down your homework Clear your desks except for

something to write with.

Once done Check-in…Update TOC:Pg. 11 Forces on Sky Diver (Activity from

Friday)Pg. 12 Friction and Gravity Check-inPg. 13- Newton's Laws- The Big 3

Open textbook to pg. 51Write the bolded sentence from that

page in your Notebook on pg. 13-- Newton’s first law of motion states…

Skip a space and define Inertia.. Found on the next page (52)

Sir Isaac Newton

A Main Man of Science and Mathematics

Newton’s Three Law’s of Motion:

1st: Law of Inertia, objects at rest will stay at rest, objects in motion will stay in motion-unless an unbalanced force acts on the object

2nd: The force needed to move an object is equal to the product of that objects mass and acceleration; F= m x a 3rd: For every action there is an equal and opposite reaction.

Newton’s Big 3

http://science.howstuffworks.com/innovation/scientific-experiments/newton-law-of-motion1.htm

1st: Objects that are at rest, stay at rest. --Objects that are in motion will stay in motion at constant velocity (speed) --unless an unbalanced force acts on it, which accelerates the object.(Speeds it up, Slows it down, or changes its direction)

If already moving--If no unbalanced forces act on the object---including friction– An object in motion will stay in motion

Newton’s First Law- Law of Inertia

Newton’s 1st Law

Inertia: the tendency of an object to resist a change in motion

The amount of inertia an object has depends on the mass of the object. ◦The greater the mass the greater the

inertia---(resistance to motion)

Ex: An empty book bag verses a book bag full of books.

What Changes Motion- Activity Complete steps 1-3- in Nb. On pg. 13.

1) Place the white eraser on top of a toy car

2) One person stand your textbook up about a foot away from the car on top of your desk

3) Predict what will happen to both the car and the eraser if you roll the car into the book- record prediction on pg. 13

4) Test your prediction- gently roll the car into the book- answer the Think it Over questionsIn your note

Discovery activity resultsWhat might be the reason for any difference between the motions of the car and the washers?- The book exerted a force on the car that caused it to stop, but the book did not exert a force on the eraser, so it continued moving..

How does inertia explain why you should wear your seat beat in a moving car?