Unit 2, Day 17

Agenda  Turn in Homework  Announcements  Catalyst  Washer Activity  Newton’s 1 st Law  Trust Fall Activity  Newton’s 2 nd Law  Break  Stand Up Activity  Newton’s 3 rd Law  Assign Homework

Turn in Homework  Please turn in the following:  Final draft of placard (20% of project grade)  Booklet with everyone’s pages (35% of project grade)

Announcements  Skateboard lockups start today  You can buy a lock for 5$ from the office  Unit 2 Exam:  Thursday 11/14 for even classes  Friday 11/15 for odd classes  Service Hours:  Come help clean the blacktop for 30 min after school! (half an hour of service)

Catalyst  Fill out the teamwork grade sheet  Include yourself  Note: not all groups may have 3 or 4 members  Keep in mind that I have been writing my own observations, so be honest with yourself. Blatant dishonesty about teamwork grades (for yourself or others) will result in your grade being severely docked

Washer Activity  Supplies:  One small jar  One playing card (DO NOT TAKE/LOSE THESE!)  One washer  Setup the supplies as follows:  Put the small jar down with the bottom on the table  Place the playing card flat over the jar to cover entire opening  Put the washer on the center of the playing card  Directions:  Quickly flick the card OR pull the card  Let everyone try a few times!

Notes  Newton’s First Law:  An object at rest stays at _________ and an object in motion stays in _________ with the same _________ and in the same _________ unless acted upon by an external _________ (a _________ or _________ )  “The Law of __________” Tendency for something to keep doing what it’s doing

Trust Fall Activity  Create groups of three  One person falls, one person catches, one person spots  Person falling should have arms out straight  Person catching should have arms ready to hook under  Person spotting should have arms under faller’s back entire time to help (just in case)  Switch so that each person catches the other two members!

Trust Fall Reflection  Describe what you think it would be like to catch someone who is:  4 years old:  12 years old:  An NFL football player:

Notes  Newton’s Second Law: Forces are a _______ or a ________ In every force there is an _____________ The ___________ increases as ___________ increases The ___________ decreases as ___________ increases =x

Notes  Units for force:  F = m * a  1 _______ = 1 ___ * ___

Break  7 Minutes  You are responsible for coming back on time  If complaints about noise level continue from other teachers, breaks will be discontinued

Notes  Practice for Newton’s Second Law MassAccelerationForceShow Work 2 kg10 N 3 kg21 N 4 kg18 N 5 kg6.2 m/s m/s N

Notes  Practice for Newton’s Second Law  Mass is the same on Earth and on the Moon  Weight is actually a __________ and requires __________  Gravity on Earth: ______  Gravity on Moon: ______

Notes  Practice for Newton’s Second Law  What is the force on someone with a mass of 60 kg on earth and on the moon? (Note: 4.4 N = 1 lb)  On Earth in Newtons?  On Earth in pounds?

Notes  Practice for Newton’s Second Law  What is the force on someone with a mass of 60 kg on earth and on the moon? (Note: 4.4 N = 1 lb)  On Moon in Newtons?  On Moon in pounds?

Stand Up Activity  Sit back to back with a partner and link arms together  Without unlinking arms (that means they should be firmly connected), try to stand up  When you are successful, join up with another pair and try again with in the group of four

Notes  Newton’s 3 rd Law  For every _________, there is an _________ and _________ _________.  Free Body Diagrams: depict the forces acting upon an object  Free Body Diagram for Earth and Moon EarthMoon

Kinematic and Force Equations EquationIncluded Variables Not Included Variables Average Velocity Change in Displacement Change in Time Acceleration Final Velocity Initial Velocity Final Velocity Initial Velocity Acceleration Change in Time Change in Displacement Average Velocity Final Velocity Initial Velocity Acceleration Change in Displacement Change in Time

Homework  If you need to edit your painting or slingshot, please do so during office hours  Unit 2 Exam:  Thursday 11/14 for even classes  Friday 11/15 for odd classes  Service Hours:  Come help clean the blacktop for 30 min after school! (half an hour of service)