How to calculate required force to exert

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Homework Help Overview

The discussion revolves around calculating the force required to move an object at a constant speed, specifically in the context of circular motion and linear motion. The original poster presents a scenario involving a 5-kilogram weight and later a 5000-gram object, seeking clarification on the necessary force for both types of movement.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the formula for centripetal force and question the radius of the circular path. There are inquiries about the completeness of the original question and the specific information needed to provide a more accurate response. The original poster seeks to understand the force required for both straight-line and circular motion.

Discussion Status

Some participants have provided guidance regarding the centripetal force formula, while others express confusion about the completeness of the question. The discussion is ongoing, with various interpretations being explored, particularly regarding the distinction between linear and circular motion.

Contextual Notes

There are indications that the original poster is a beginner, and some posts suggest a lack of clarity in the question being asked. The radius for the circular motion is noted as 150mm, but further details about other forces, such as friction, are not fully addressed.

Moenieb.David
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Hi,

I have a 5 kilogram weight that i want to move at a constant speed of 2m/s within a circle, thus the distance is negligible.
how do i calculate the force that is required to move the weight at that speed?

And yes, i am a beginner :-)
Thanks in advance
 
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The centripetal force required is given by mv^2/r. What's the radius of the circle?
 
hi,
Thanks for the response
The radius is 150mm
 
question seems incomplete
please mention the complete question :D
 
Hi Selwys,

Thanks for the response, but what other info do you require?
What I wanted to know was how do I calculate the amount the FORCE required to move an object at a certain speed.
Lets say i want to move a 5000 gram object at 2 metres per second along a: a straight line and b: in a circle. How much force do I need to apply to the object to get that type of movement speed for the object
Does this make sense?
 
Selwyn said:
question seems incomplete
please mention the complete question :D

Hi Selwys,

Thanks for the response, but what other info do you require?
What I wanted to know was how do I calculate the amount the FORCE required to move an object at a certain speed.
Lets say i want to move a 5000 gram object at 2 metres per second along a: a straight line and b: in a circle. How much force do I need to apply to the object to get that type of movement speed for the object
Does this make sense?
 
Moenieb.David said:
hi,
Thanks for the response
The radius is 150mm
Sorry, I must have missed this post. In any case, the centripetal force required is given by the formula in my earlier post.
Moenieb.David said:
What I wanted to know was how do I calculate the amount the FORCE required to move an object at a certain speed.
Lets say i want to move a 5000 gram object at 2 metres per second along a: a straight line and b: in a circle. How much force do I need to apply to the object to get that type of movement speed for the object
Does this make sense?
No net force is required to move an object in a straight line at constant speed. (Consider Newton's First Law.) Of course, if friction or other forces are involved you'll have to overcome them.

To make something move in a circle requires a net centripetal ('toward the center') force.
 
Moenieb.David said:
Hi Selwys,

Thanks for the response, but what other info do you require?
What I wanted to know was how do I calculate the amount the FORCE required to move an object at a certain speed.
Lets say i want to move a 5000 gram object at 2 metres per second along a: a straight line and b: in a circle. How much force do I need to apply to the object to get that type of movement speed for the object
Does this make sense?
ah sorry sorry :D
i didnt really read the question
yeah the force applied can be given by m*v^2/r
well u should call it velocity since this speed has direction
nevermind...
 

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