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Forces: Equilibrium Examples

Physics 101: Lecture 2, Pg 1 Forces: Equilibrium Examples Physics 101: Lecture 02 Today s lecture will cover Textbook Sections Phys 101 URL: Read the course web page! Physics 101: Lecture 2, Pg 2 W=GMEarthmrEarth2=mGMEarthrEarth2 mgOverview Last Lecture Newton s Laws of Motion FIRST LAW: Inertia SECOND LAW: Fnet = ma THIRD LAW: Action/reaction pairs Gravity = (near Earth s surface!) Today Forces as Vectors Free Body Diagrams to Determine Fnet Draw coordinate axes, each direction is independent. Identify/draw all force vectors Friction: kinetic f = mkN; static f ms N Contact Forces Springs and Tension Physics 101: Lecture 2, Pg 3 Forces as Vectors Last lecture we calculated the force of gravity on a book ( its WEIGHT): Calculate the gravitational force on a 3 kg book held 1 meter above the surface of the earth. W = G MEarth m / rEarth2 = ( m3 / (kg s2)) (6x1024 kg) (3 kg)/ ( + 1)2 m2 = kg m/s2 = N We missed something: The direction!

You should draw axes parallel and perpendicular to motion! Step 2 - Forces! T W Weight is not in x or y direction! Need to DECOMPOSE it! q N . Physics 101: Lecture 2, Pg 13 Vector Decomposition T W N q q q W q W x W y Note that W W y W x …

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