What Forces Act on a Driven Pendulum?

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The discussion centers on determining the net force acting on a driven pendulum, with key forces identified as the driving force (Fd = mk) and gravitational force (Fg = mg). Participants question the terminology "net force done" and the necessity of including the restoring force (Fr), which is implied but not explicitly mentioned in the problem. Clarifications are sought regarding the proportionality of the driving force to the mass and whether gravitational acceleration (g) is being treated as a vector. The conversation highlights the need to account for all forces acting on the pendulum to understand its motion accurately. Understanding these forces is crucial for solving the problem effectively.
cytochrome
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Homework Statement


What is the net force done on a driven pendulum?

Homework Equations


Fd=mk (driving force)
Fg=mg (Gravitational force)
Fr=? (Do I need to include this?)


The Attempt at a Solution


Fnet = Fd + Fg = mk + mg

I'm not sure if I need to include the restoring force, which was not given in the problem but I know it is there.
 
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cytochrome said:
What is the net force done on a driven pendulum?
Force "done"? Unusual terminology. Does it really say that?

Homework Equations


Fd=mk (driving force)
Why is the driving force proportional to the mass of the pendulum? Or is this some other mass?
Fg=mg (Gravitational force)
Are you using g as a vector here? If not, you need to consider that not all the forces will be collinear.
Fr=? (Do I need to include this?)
Depends what it is. There certainly is another force somewhere, or the pendulum would drop like a stone.
 

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