PHYS 1003 Lecture Notes - Lecture 5: Gravitational Lens, Speed, Gravitational Field
26 Dec 2017
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Document Summary
Objects in circular motion have centripetal acceleration with direction to center of rotation. In a system forces can provide a centripetal force that keeps them from moving in circle (not fundamental force) o o. Commonly: tension, frictional, gravitational and magnetic forces on charged particles. Fundamental forces/interactions aren"t reducible to more basic interaction: gravitation, electromagnetism, the weak interaction, the strong interaction. Tension as centripetal force (ft = fc): object attached to rope being whirled around o. Rope will break when ft supplied is > than breaking tension. When rope breaks, it moves in the direction of instantaneous (tangential) velocity. (radius)/t) Friction as centripetal force (ff = fc): friction responsible to circular motion such as car moving around curve and objects on turntable (fn opposite to fg in vertical and only fs in horizontal) Normal as centripetal force: rotati(cid:374)g pa(cid:272)e tatio(cid:374): desig(cid:374)ed to produ(cid:272)e (cid:862)artifi(cid:272)ial gra(cid:448)it(cid:455)(cid:863) Force objects exert on each other = gm1m2/r2 where g is universal gravitational.
