Question

the bob of simple pendulum of length 1m has mass 100g and speed 1.4 m/s at lowest point . find tension in string at this moment

Answer 1

At lowest point, two forces are acting on the bob

a) Tension in string upwards

b) mg downwards.

As it is moving along circular path hence

T−mg=mv2rT−mg=mv2r

=> T=mg+mv2rT=mg+mv2r

Given mm = 100g = 0.1 Kg, vv= 1.4 m/s, rr= ll= 1 m, g=10m/s2g=10m/s2

Hence T = 1.196 N


Hope you are satisfied.....