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I. II. III. IV. V. VI. VII. Physics Test Review - Chp. 8 and 9 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 = (mv 2 )/r ● centripetal acceleration ○ a c = v 2 /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 (Nm 2 )/kg 2 ● F g = G∙(m 1 m 2 )/r 2 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, mv 2 ● moment of inertia,

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Angular acceleration ● change in angular speed per change in time ● ● linear accel. = radius of circle x angular accel. angular accel. = τ / I