At the bottom of a swing for a pendulum, e.g. a mass on a string. it has a speed

ID: 1971636 • Letter: A

Question

At the bottom of a swing for a pendulum, e.g. a mass on a string. it has a speed of v. Is the acceleration zero or nonzero? If non-zero, in what direction does it point? At the bottom. is there only centripetal acceleration, or is it exactly cancelled by the gravitational acceleration, or is it a sum of the two? Is the tension in the string zero or non-zero? IF non-zero, what value would it have t in terms of m, I, v, g). What is the TOTAL force on the mass at the bottom of the swing? Is it the same us the tension in the string?

Explanation / Answer

a) nonzero (radial direction)

b) It's the sum of the two

c) non-zero, T= mv2/R - mg

d) same as the Tension of the string ( part c shows that T is the F)

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At the bottom of a swing for a pendulum, e.g. a mass on a string. it has a speed

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