# A Physics problem

hi ,

1.A force of 24 N acts on a body causing its movement on an inclined plane with acceleration 3 m/s^2 . calculate the frictional force.

so can u illustrate the answer to me?

Thanks

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You will need to provide more information to allow us to help with this.
What is the mass in kg? The angle of the plane? The direction of the force?

You will need to provide more information to allow us to help with this.
What is the mass in kg? The angle of the plane? The direction of the force?
No , I just forgot to write the mass which is 5 Kg .This is the All of the Given information.
But for now i have a suggestion and all you have to do is to check w heather I'm right or not.

The net force acting on the system = The force causing the acceleration of the ball - Friction force
right??
well
Net force = 24 - Friction = (5*3)
Net force = 24 - Friction = 15
therefore friction force = 24 - 15 = 9 newtons

Right??

PhanthomJay
Homework Helper
Gold Member
No , I just forgot to write the mass which is 5 Kg .This is the All of the Given information.
But for now i have a suggestion and all you have to do is to check w heather I'm right or not.

The net force acting on the system = The force causing the acceleration of the ball - Friction force
right??
well
Net force = 24 - Friction = (5*3)
Net force = 24 - Friction = 15
therefore friction force = 24 - 15 = 9 newtons

Right??
That looks good, provided that the applied 24 N force acts parallel to the plane. Since the problem does not specify that, I guess you'll have to assume it.

If the plane is inclined and the force acts parallel to it, the net force is not simply "24 - friction". The weight of the mass also has a component acting against the 24N.

PhanthomJay
Indeed it does, my error 