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Physics Test Review - Chp. 8 and 9 I. II. III. IV. V. VI. VII. Angular speed,ω ● radians per time ○ turns around circle x 2π ● finding linear speed of rotating object, v = (ω)(r) Centripetal force ● all natural forces that make an object go in circular motion ○ Fc = (mv2)/r ● centripetal acceleration ○ ac = v2/r ● object in orbit, driving around curved road (flat or banked), object spinning while attached to string. Universal gravitation ● G = 6.67 x 10-11 (Nm2)/kg2 ● Fg = G∙(m1m2)/r2 Torque ● Force applied some distance away from a center of rotation ● eqn: τ = r∙F ● static equilibrium: torque on both sides of center of rotation must be equal ● applying torque at an angle Center of gravity ● for an object to remain upright, center of gravity must act inside area of support Rotational Inertia ● dependent on mass and mass distribution, mv2 ● moment of inertia, I Angular acceleration ● change in angular speed per change in time ● linear accel. = radius of circle x angular accel. ● angular accel. = τ / I