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Transcript
Physics Chapter 7 Forces in Two Dimensions Equilibrium State of an object when the net force is zero Equilibrant The force that when applied to a situation produces a state of equilibrium Equilibrium in 2 directions The forces in both directions must total zero to be in equilibrium. SO… The forces in the x-direction must total zero The forces is the y-direction must total zero REMEMBER Normal Force Always perpendicular to the surface Force of Gravity Always earth perpendicular to the Force due to gravity Normal Force Projectile Motion Motion in the xdirection and the motion in the y-direction are independent of each other. X direction Y direction Notice how the same point going up reflects to a corresponding point going down. V vert v hor Circular Motion Uniform Circular Motion The movement of an object or point mass at constant speed around a circle with a fixed radius. v1 r1 Δr r1 v2 r2 r2 Centripetal Acceleration The acceleration of an object in uniform circular motion always points in toward the center of that circle. v1 v2 a r v1 v2 Δv v r a v t t Centripetal Acceleration v1 v2 a v1 v2 r Δv r v r v r v rt vt 2r 2 4 r T ac 2 r T 2 2 v ac r Newton’s 2nd Law for Centripetal Acceleration F ma mv Fnet r 2 4 r Fnet m 2 T 2 Lever Arm Length of the rotation Torque Product of the force and the lever arm