Solve Simple Pendulum Homework: Max Velocity of Pendulum Bob

[Basne_Kaled]

Homework Statement

A pendulm bob weighing 0.1 kg hangs from a light tread. it has a length of 25 cm and a period is 1 second and the force is 1.1 N. what is the maximum velocity of the pendulum bob?

Homework Equations

F = M * A
V = U + A*T

The Attempt at a Solution

Using these formulas i got the final velocity, but it does not seem right!

 

[DorianG]

Acceleration isn't constant so you can't use F=ma, or v = u + at
When is the velocity at a maximum do you think?

 

[Carid]

Do you have access to internet? Typing in "simple pendulum" will enable you to find these formulae.

Period = 2*PI*SQRT(Length/g)
You shouldn't need this one but beware of units if you use it.

RestoringForce= -Mass*g*sin(theta)
This can get us the maximum angle, and thus the maximum height of the bob, and thus the potential energy, and thus the kinetic energy and thus the maximum velocity.

 

[Basne_Kaled]

The maximum velocity is at the equlibrium point. i.e when the pendulum is pointing down.