Relating Pendulum SHM


by ehabmozart
Tags: pendulum, relating
ehabmozart
ehabmozart is offline
#1
Jun12-12, 05:06 PM
P: 194
I've seen in many sites that a pendulum restoring force Fnet = mg sin theta... Why did we actually get the vector direction of the weight and not the vector of the tension.. Simply, as in centrepetal force.. It would be Tsin theta would be the net restoring force??? Thanks!
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nasu
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#2
Jun12-12, 05:37 PM
P: 1,904
The restoring force is the net force acting on the pendulum's bob.
If you add the tension and the weight (as vectors) and consider inextensible suspension string the resultant is tangent to the trajectory and its magnitude is mg sinθ.
ehabmozart
ehabmozart is offline
#3
Jun12-12, 05:54 PM
P: 194
Can i have illustrations then??

nasu
nasu is offline
#4
Jun13-12, 10:40 PM
P: 1,904

Relating Pendulum SHM


Sure you can. Draw the forces acting on the pendulum and then take the components along the tangential and radial directions.


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