How do i find applied force if it not given?

AI Thread Summary
To find applied force when it is not given, one must typically resolve the forces involved and determine the normal force. If the coefficient of friction is also unknown, it becomes impossible to calculate the force of friction. For determining the coefficient of friction on different surfaces, at least three equations are necessary; without them, a solution cannot be found. The discussion emphasizes the need for clearer problem framing to facilitate assistance. Ultimately, applying Newton's laws and understanding the relationship between friction, normal force, and applied force is crucial for solving these types of problems.
puni12
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how do i find applied force if it not given?
how do i find force of friction if coefficient of friction is also not given?
how do i find coefficient of friction of objects on 3 different surfaces?
(what should be the variable?)
thanks so much
 
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the way is same, resolve the forces, get the normal. if co-oefiicient is not given, its very simple, you can't find. for three surface, if there are less than 3 equations, then the solution is also simple. you can't help.
 
make your question a bit clearer. frame it in a for of sum
 
puni12 said:
how do i find...
The particulars of how you'd solve for applied force, or friction, or the coefficient of friction depend on the exact problem. But usually it will involved applying Newton's laws and the simple model of friction in terms of \mu and normal force.

Pick a specific problem and give it a try.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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