# fundamental forces.pdf - Welcome to Physics 101! Lecture...

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Welcome to Physics 101!Welcome to Physics 101!Lecture 01: Introduction toForcesLecture 01: Introduction toForcesLecture 01: Introduction toForcesNewton’s LawsForcesFree Body Diagrams
Newton’s 1stLaw of MotionNewton’s 1stLaw of MotionNewton’s 1stLaw of MotionNewton’s 1stLaw of MotionèèIf the sum of all external forces on an object is zero,then its speed and direction will not change. (Know asthe Law ofInertia.)Example: air hockey tableWhen the puck travels with no net force on it, itmoves in a straight line with constant speed.The only time the speed or direction changes iswhen a net force (from the walls or mallets) isexerted on the puck!
Newton’s 2ndLaw of MotionNewton’s 2ndLaw of MotionNewton’s 2ndLaw of MotionNewton’s 2ndLaw of MotionèIf a nonzero net force is applied to an object its motionwill change. (The change is described by the equationF= ma.)Example: dropping a bookWhen you drop a Calculus book from your 10thstorydorm window, there is a net force acting on it(gravity) thus it begins to accelerate toward thestreet below!

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