1. At the bottom of a swing for a pendulum, e.g. a mass on a string, it has a sp
ID: 2263131 • Letter: 1
Question
1. At the bottom of a swing for a pendulum, e.g. a mass on a string, it has a speed of v.
(a) Is the acceleration zero or nonzero? If non-zero, in what direction does it point?
(b) 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?
(c) Is the tension in the string zero or non-zero? IF non-zero, what value would it have (in terms of m, L, v, g).
(d) What is the TOTAL force on the mass at the bottom of the swing? Is it the same as the tension in the string?
Explanation / Answer
a) non zero. it is upward direction.
b) only centripetal acceleration
c) non, zero. T = m*g + m*v^2/L
d) Fnet = m*v^2/L.
no it is not is equal to tension.
Fnet = T - m*g
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