1. N EWTON ’ S L AWS

2. N EWTON ’ S 3 L AWS Inertia mass motion F=ma “Newton” relationship Equal and opposite forces Push and Push Back Action and Reaction

3. I NERTIA  An object will stay at rest or in constant motion until a force acts upon it. The more mass an object has, the more inertia it has.

4. F ORCE IS EQUAL TO MASS TIMES ACCELERATION  The force that an object experiences is equal to the mass times acceleration. F=ma

5. F OR EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION  Push and Push Back

6. N EWTON ’ S 3 L AWS ???

9. N OTES Q UESTIONS : PG. 271, 272  What is free fall?  What is Earth’s free fall acceleration?  How do you calculate weight?  Why do astronauts float in space?  How is mass and weight different?  How is mass and weight similar?  How are animals bodies designed to respond to gravity in their environments?  What causes terminal velocity?

10. G RAVITY, W EIGHT, & M ASS  Gravity is the natural pull that exists between two objects.  Gravity depends on 2 variables:  Mass  Distance

11. MORE MASS, MORE GRAVITY MASS GRAVITY

12. MORE DISTANCE, LESS GRAVITY DISTANCE GRAVITY

13. G RAVITY IS WHAT KEEPS THE PLANETS GOING AROUND THE SUN

15. W EIGHT = MASS X GRAVITY  Force = mass X acceleration  F=ma  Weight = mass (kg) X gravity (9.8 m/s 2 )  w=mg  Weight is measured in Newtons because it is a measurement of Force  1 lb = 4.4 Newtons

16. Objects weigh more on planet Earth than on the moon, because the Earth is more massive. That is to say that it has more mass!

18. E VERYTHING FALLS TO EARTH AT AN ACCELERATION OF 9.8 M / S 2

19. W HAT IS TERMINAL VELOCITY, AND WHAT CAUSES IT ?

20. M EASURE THE MASS ( IN KILOGRAMS ) AND WEIGHT ( NEWTONS AND POUNDS ) OF THE FOLLOWING OBJECTS Mass (kg)Weight (N)Weight (lbs) Pencil Piece of paper Marble Ball Ruler Cell phone

21. define In my own words illustrate Use in a sentence work define In my own words illustrate Use in a sentence power Physical Science Book Page 284 -287

22. W ORK  Work is equal to the amount of force that is applied to an object times a certain distance.  W=Fd  Measured in Joules (J)  This hammer applies a force to the nail for a certain distance. The hammer “does work” on the nail

23. P OWER  Power is the amount of work that is done over a certain amount of time.  P=W/t  Power is measured in Watts (W) This bicyclist has a certain amount of power. He does a certain amount of work over a certain amount of time.

24. This 500 kg car travels from 45 m/s to 100 m/s in just 2.5 seconds. In that time, it travels 181 meters. What is the car’s: Acceleration? Force? Work? Power?

25. W ORK AND P OWER L AB  Complete the Inquiry Lab on page 287.  Your weight in pounds X 4.4 gives you your weight in Newtons.  If you don’t want to share your weight, that is fine. Just use the imaginary weight of 600 N.  You have 20 minutes to complete this assignment.  I will come around and check this in your notebook. DO NOT TURN IT IN!!

26. H OW TO STUDY FOR YOUR TEST  Make sure that you have all of your notes organized.  Read your warm-ups, notes, and activities several times.  Make note cards for the main ideas/key terms.

27. H OW TO STUDY FOR YOUR TEST  Note Cards  Inertia  Gravity, mass, weight  Newton’s Laws  Force (F=ma)  Work (W=Fd)  Power (P=W/t)