How to calculate required force to exert

[Moenieb.David]

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

 

[Doc Al]

The centripetal force required is given by mv^2/r. What's the radius of the circle?

 

[Moenieb.David]

hi,
Thanks for the response
The radius is 150mm

 

[Selwyn]

question seems incomplete
please mention the complete question :D

 

[Moenieb.David]

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]

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?

 

[Doc Al]

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.

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.

 

[Selwyn]

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...