1. Newton’s Three Laws of Motion Mr. Bretl Middle School Science

2. Sir Isaac Newton 1642 - 1727

3. An object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity… …unless acted upon by an outside force. Newton’s 1 st Law

4. Force equals mass times acceleration. Newton’s 2 nd Law

5. Force = Mass x Acceleration F = ma Measured in Newtons. 1 N = 1 kg x m/s² Newton’s 2 nd Law

6. Acceleration Acceleration is a change in… SPEED or DIRECTION (velocity)

7. Example Newton’s 2 nd Law Force = mass x acceleration Force 2,000 N = 1,000 kg x 2 m/s/s Newtons (N) Kilograms (kg) Meters per second per second (m/s²)

8. For every action, there is an opposite and equal reaction. Newton’s 3 rd Law

9. For every action, there is an opposite and equal reaction. Newton’s 3 rd Law

10. For every action, there is an opposite and equal reaction. Newton’s 3 rd Law http://www.youtube.com/watch?v=mFNe_pFZrsA

11. Review

12. “The vis insita, or innate force of matter, is a power of resisting by which every body, as much as in it lies, endeavors to preserve its present state, whether it be of rest or of moving uniformly forward in a straight line.” -Sir Isaac Newton Philosophiæ Naturalis Principia Mathematica Mathematical Principles of Natural Philosophy Inertia

13. Which of Newton’s Three Laws is the Law of Inertia? http://www.youtube.com/watch?v=T1ux9D7-O38

14. Inertia

15.  When did Sir Isaac Newton live and what else is he famous for?  What is Newton’s First Law?  What is Newton’s Second Law?  What is Newton’s Third Law?  What is inertia?  What is the difference between velocity and acceleration?  A 2 kg arrow is shot with a force of 100 N. What is it’s acceleration when shot? Review

16.  S.7.2.3.3 – The student recognizes and describes Newton’s Laws of Motion  S.7.7.2.1 – The student recognizes that new knowledge leads to new discoveries, replicates historic experiments to understand principles of science, and relates contributions of men and women to the fields of science.  S.7.2.3.2 – The student describes, measures, and represents data on a graph showing the motion of an object (position, direction of motion, and speed) Kansas State Standards