- #1

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- 3

- Homework Statement
- physical pendulum

- Relevant Equations
- torque=Ia

hello, i have a question about the forces that act on a rod at it's pivot point. the rod is free to rotate about the pivot point at the edge and it starts from rest parallel to the ground.the question is : when it reach to angle theta find the a] the angular velocity b] angular acceleration c] the forces acts on the rod at the pivot point (normal)

the rod is of length L and mass M

i found w^2=(3gcos(theta))/L

angular acceleration=alpha=(3gsin(theta))/2L

c- i try to calculate the normal force that acts toward the pivot point

N-mgcos(theta)=Mw^2R

and R=L/2. but it's not the answer and i searched at the interent and find that there are 2 forces act at the pivot point of the rod and i didn't understand why. thanks for the help.

the rod is of length L and mass M

i found w^2=(3gcos(theta))/L

angular acceleration=alpha=(3gsin(theta))/2L

c- i try to calculate the normal force that acts toward the pivot point

N-mgcos(theta)=Mw^2R

and R=L/2. but it's not the answer and i searched at the interent and find that there are 2 forces act at the pivot point of the rod and i didn't understand why. thanks for the help.