Bell Work: Centripetal Motion

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Presentation transcript:

Bell Work: Centripetal Motion If you increase the radius, the object will move ( faster / slower ). If you increase the centripetal force, the object will move ( faster / slower ). If you increase the mass, the object will move ( faster / slower ). The _____ and _____ are directly related to the speed. The ______ is inversely related to the speed.

How effectively a force causes rotation Symbol is tau (τ) Torque How effectively a force causes rotation Symbol is tau (τ)

Fulcrum: The point of rotation

Force should be perpendicular to the lever arm

Equation: OR τ = torque unit = N∙m F = force perpendicular to the lever arm unit = N d or L = length of lever arm unit = m

At equilibrium Fnet = 0 N At rest or spinning at a constant speed All torques add up to zero clockwise torque = counterclockwise torque

Balanced Torque Girl’s torque = Boy’s torque So, if the girl has more force (weight) her distance should be lower to balance the boy.

Example: Girl has a mass of 25 kg and is 120 cm from the fulcrum Example: Girl has a mass of 25 kg and is 120 cm from the fulcrum. What is the boy’s mass if he is balanced 140 cm from the fulcrum?