1. #1.) Principia A book written by Newton in which he describes forces and how they act on moving objects. It includes his 3 Laws of Motion.

2. #2.) Motions of the Planets/Universal Law of Gravity If you know how a force acts on an object, you can calculate anything about its motion using the Laws of Motion.

3. #3.) FORCE/7-9 page 183 You must know the DIRECTION of the FORCE to understand how it will effect motion. The boy will turn to the side and speed up.

4. 4.) Newton’s 2 nd Law of Motion The Law of Acceleration F=ma FORCE=mass times acceleration The more mass and object has the MORE FORCE you need to make it accelerate.

5. Law of Acceleration/Newton’s 2 nd Law of Motion

6. 2 nd Law continued

7. #4) How is the 2 nd Law different from the 1 st Law? Newton’s 2 nd Law of Motion deals with the MASS of an object and how it needs a FORCE to make it ACCELERATE

8. #5.) A NEWTON is a measurement of FORCE

9. #6.)Ft=mv2-mv1 The NET FORCE (Ft) that acts on an object is related to the INITIAL VELOCITY (v1) and the FINAL VELOCITY (v2) of the object FORCE is defined relative to a FRAME OF REFERENCE When a NET FORCE acts on an object…the objects MOMENTUM CHANGES.

10. #7.) Normal Force The OUTWARD FORCE from the table pushes up towards the bottom of the book at a 90 DEGREE ANGLE The NORMAL FORCE is supplied by the strength of the object (always at a 90 degree angle

11. #8.) Ft=mv2-mv1 Ft=2 m/s-3 m/s=-1 m/s BACKWARDS (opposite direction of motion)

12. #9.) Terminal Velocity The FORCE of air resistance pushing up against the skydiver is equal to the FORCE of gravity pulling him down. GRAVITY = TERMINAL VELOCITY AIR RESISTANCE

13. #10.) Unbalanced Forces Speeding Up-FORCE (push or pull) is in the SAME DIRECTION as the VELOCITY Slowing Down-FORCE (push or pull) is in the OPPOSITE DIRECTION as the VELOCITY Turning-The NET FORCE acts at an ANGLE to the direction of the MOTION

14. Speeding up, Slowing down, Turning

15. Section Assessment #2 Gravity Momentum Air resistance Normal Force

16. Assessment #3 If an object picks up speed = force in the SAME DIRECTION If an object loses speed=force in the OPPOSITE direction. If an object CHANGES DIRECTION=force at an ANGLE to the path of the objects original motion.

17. Mass versus WEIGHT Venus 0.91 x 110=100.1 lbs. Mars 0.38 x 110=39.6 lbs. Jupiter 2.5 x 110=253 lbs. Saturn/Neptune 1.1 x 110=121