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# Physics 4-1 Changes in Motion Physics 4-2 to 4-4 Newton's Laws - PowerPoint PPT Presentation

Physics 4-1 Changes in Motion Physics 4-2 to 4-4 Newton's Laws. Compiled by Jack Graham 2013. Physics 4-1 Changes in Motion Force is a vector Free Body Diagrams (figure 4-4 a-f).

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### Physics 4-1 Changes in MotionPhysics 4-2 to 4-4 Newton's Laws

Compiled by Jack Graham 2013

Physics 4-1 Changes in MotionForce is a vectorFree Body Diagrams (figure 4-4 a-f)

Physics 4-2 Newton's First lawInertia  An object at rest remains at rest. An object in motion continues in motion with constant velocity (constant straight line speed) unless the object experiences a net external force. IFF the net external force = 0 then its acceleration = 0.net external force  vector sum of all forces acting on an object.

Physics 4-2 Newton's First lawMass  measure of inertiaEquilibrium   net external forces = 0

Physics 4-3 Newton's 2nd and 3rd Laws2nd Law  Force is proportional to mass and acceleration F = ma3rd Law  Forces always exist in pairs such that they are oppositely directed and equal in magnitude.These pairs are called “action-reaction pairs”.Action-reaction pairs are simultaneous.Each half of the action-reaction pair act on different objects.Field forces also exist in pairs.For A-R pairs ma = - MA

Everyday ForcesWeight: Me versus The Earth“Normal Force” = “N”  Compression Resistance of molecular substancesat right angles to surface of objects in contact with each otherFriction Force  proportional to “N”Static Friction  standing still Fs = - F appliedKinetic Friction  Fk = - µF applied so net Fn= F-Fkµs = Coefficient of Static Friction  Fs,max/Fnµk = Coefficient of Kinetic Friction  Fk/FnsoFf = - µFn

Assignment: All Section Reviews (Do right after you read them, please)Assignment after all reading: Read CBL Sensors ExperimentDo Problems: ALL Conceptual Questions, plus # 11, 13, 15, 21, 29, 39, 43