Physics and Newtons Laws

High School Newton’s Law NEXT Newton’s Laws Newton’s First Law Law of Inertia  Newton’s Second Law F = ma  Newton’s Third Law Action Reaction  Law of Universal Gravitation Gmm'  F r 2 NEXT PREVIOUS Mass  …is  …is measured in kilograms. the measure of the inertia of an object.  Inertia is the natural tendency of a body resist changes in motion. NEXT PREVIOUS Force  …the agency of change. the velocity.  …changes  …is a vector quantity. in Newton’s.  ...measured NEXT PREVIOUS Newton’s First Law  Law  “A of Inertia body remains at rest or moves in a straight line at a constant speed unless acted upon by a force.” NEXT PREVIOUS Newton’s First Law mention of chemical composition  No mention of terrestrial or celestial realms  Force required when object changes motion  Acceleration is the observable consequence of forces acting NEXT PREVIOUS  No Newton’s Second Law The Sum of the Forces acting on a body is proportional to the acceleration that the body experiences F  a  F = (mass) a NEXT PREVIOUS   F  ma Net Force  Fx  max  Fy  ma y  Fz  maz NEXT PREVIOUS Newton’s Third Law  Action-Reaction  For every action force there is an equal and opposite reaction force NEXT PREVIOUS The Law of Gravity mass exerts a force of attraction on every other mass.  The math…  Every Gmm' F 2 r G = 6.67  10-11 N·m2/kg2 NEXT PREVIOUS Gravity Questions  Did the Moon exert a gravitational force on the Apollo astronauts? kind of objects can exert a gravitational force on other objects?  What NEXT PREVIOUS Gravity Questions  The constant G is a rather small number. What kind of objects can exert strong gravitational forces? the distance between two objects in space is doubled, then what happens to the gravitational force between them? PREVIOUS  If NEXT Weight  The weight of an object FW is the gravitational force acting downward on the object. mg  FW = NEXT PREVIOUS Tension (Tensile Force)  Tension is the force in a string, chain or tendon that is applied tending to stretch it.  FT NEXT PREVIOUS Normal Force  The normal force on an object that is being supported by a surface is the component of the supporting force that is perpendicular to the surface.  FN NEXT PREVIOUS Coefficient of Friction  Kinetic Friction • Ff = mk FN Friction • Ff  ms FN most cases, mk < ms. PREVIOUS  Static  In NEXT On to problems...