Force Newtons Laws Introduction First Law Inertia Second

Force Newton’s Laws Introduction First Law - Inertia Second Law – Force and Acceleration Third Law – Action and Reaction 1

Force Newton’s Laws Newton’s three laws of motion are… Law #1 2 A body at rest will stay at rest unless acted upon by an external agent and a body in motion will remain with the same motion, in a straight line, unless acted upon by an external agent. Law #2 The force acting on a body is equal to the product of its mass times its acceleration, Law #3 Each action has an equal an opposite reaction.

Force Newton’s Laws First Law of Motion Law #1 A body at rest will stay at rest unless acted upon by an external agent and a body in motion will remain with the same motion, in a straight line, unless acted upon by an external agent. In other words, a change in a particle’s (body’s) speed or direction can only occur if there is an external force (agent) acting on it. This can also be seen for each component of the force. 3

Force Newton’s Laws There is something wrong with the way the ball bounces. Do you know what it is? Think about the forces that are present and their directions. Think about Newton’s First Law. Maybe the next animation will help. 4

Force Newton’s Laws Second Law of Motion Law #2 The force acting on a body is equal to the product of its mass times its acceleration, In other words, the sum of the forces acting on a particle is proportional to its acceleration. The mass is the constant of proportionality. 5

Force Newton’s Laws Third Law of Motion Law #3 Each action has an equal an opposite reaction. In other words, for every force acting on a particle, there is an equal and opposite force that the particle puts on the object that gave it the original force. 6

Force Newton’s Laws Name some of the action/reaction pairs in this picture. 7

Force Newton’s Laws Name some of the action/reaction pairs in this picture. 8

Force Newton’s Laws Name some of the action/reaction pairs in this picture. 9

Force Newton’s Laws Name some of the action/reaction pairs in this picture. 10

Force Newton’s Laws Name some of the action/reaction pairs in this picture. 11

Force Newton’s Laws Name some of the action/reaction pairs in this picture. 12