Newton’s Three Laws of Motion Mr. Bretl Middle School Science
Sir Isaac Newton
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
Force equals mass times acceleration. Newton’s 2 nd Law
Force = Mass x Acceleration F = ma Measured in Newtons. 1 N = 1 kg x m/s² Newton’s 2 nd Law
Acceleration Acceleration is a change in… SPEED or DIRECTION (velocity)
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)
For every action, there is an opposite and equal reaction. Newton’s 3 rd Law
For every action, there is an opposite and equal reaction. Newton’s 3 rd Law
For every action, there is an opposite and equal reaction. Newton’s 3 rd Law
Review
“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
Which of Newton’s Three Laws is the Law of Inertia?
Inertia
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
S – The student recognizes and describes Newton’s Laws of Motion S – 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 – 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