2. Newton’s first law of motion: an object at rest/motion will stay at rest/motion until a force acts on it.
Law of Inertia

3. Newton’s second law of motion: how much an object accelerates depends on its mass and the force acting on it.
F= m/a F m a

4. Newton’s third law of motion: Every action has an equal and opposite reaction.

5. Newton’s Universal Gravitational Law: gravity is a force of attraction between all matter in the universe

6. Newton’s Universal Gravitational Law: force of gravity is equal to the gravitational constant (G) multiplied the mass of the two objects (M,m). Divided by the distance between them squared (d2)
Directly Proportional: Mass to Fg
Indirectly Proportional: Distance to Fg

7. Forces Fg=GMm F=m*a d2 Which formula should we use
to finish our yellow packet?

9. Egg Drop Worksheet and Write Up
Lots of unfinished work
Why?
Yellow Sheets should have been completed, close to completed by Wednesday/Thursday
Leaving only lab reports on Friday
Let’s correct your C, E, R’s.

13. Don’t like your score?
Write your lab reports again

14. Iffat Sardharwalla March 2010
Forces
Only the effect of a force can be seen.
Forces are measured in (N)
They usually act in pairs (1st Law of motion/ Inertia)
They always act in certain direction
A newton meter is used to measure forces.
Iffat Sardharwalla March 2010

15. Iffat Sardharwalla March 2010
Forces
Two things make up a force 1. Size: how strong a push or pull is, and 2. Direction: which way it pushes or pulls. We draw forces as arrows The length of the arrow shows how strong the force is
2. Direction it points shows the direction of the force.
Iffat Sardharwalla March 2010

16. Balanced and Unbalanced Forces
Change the Speed and or
Direction of Moving Objects
Balanced Forces produce
NO change in Movement
The forces on the person are balanced
The floor pushes upward on the person
Gravity pulls downwards on the person
Greater Force
Smaller Force
Iffat Sardharwalla March 2010

17. Forces & Movement Forces are nearly always PUSHES and PULLS
Iffat Sardharwalla March 2010

18. Forces can make objects do FIVE things
3. Change Direction
Like hitting a ball with a bat
2. Slow down
Like drag or air resistance
Speed up
Like kicking a ball
5. Change shape
Like stretching, twisting, compressing and bending
4. Turn
Like turning a spanner wrench
Iffat Sardharwalla March 2010

20. http://image. slidesharecdn

23. http://physicsprojects. wikispaces

24. Update your TOC Work and Simple Machines LT:
What is the definition of work?
What are simple machines?