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M9-Conceptual Qs

M9-Conceptual Qs - Name Sharan Multani Name Nick Podreborac...

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Unformatted text preview: 12/1/2010 Name: Sharan Multani Name: Nick Podreborac M9 - Conceptual Questions Q1.) Consider a simple pendulum (no friction). Does the angular acceleration of the mass remain constant during its motion? If not, then how does the angular acceleration change? Is the angular acceleration ever equal to zero when the pendulum is in motion? If yes, then when does that happen? Ans1.) No angular acceleration is not constant, it is sinusoidal with amplitude g/L. Is the angular acceleration ever = 0 when the pendulum is in motion? Yes, it is 0 whenever sin(t*sqrt(g/L) = 0, at which time a' = sqrt(g/L). That is exactly when a = 0 Angular acceleration = torque / moment of inertia ; and torque = force*perpendicular distance of line of action of force from axis of rotation here only two external forces are acting on pendulums bob i.e. gravitational pull (acting vertically downward.)and tension in the string. since the line of action of tension always passes through the point of support ( for pendulums tension in the string....
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