Really simple Question Just want to see if I'm applying correctly

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To find the net force acting on a 3 kg object moving down an incline over a distance of 0.4 m in 0.25 seconds, first calculate the acceleration using the equation for uniform acceleration. Assuming the object starts at rest, the acceleration can be derived from the displacement formula. After determining the acceleration, apply Newton's second law (F = ma) to find the net force. The discussion emphasizes the importance of showing calculations to verify the approach. Proper application of these equations will yield the correct net force.
binahkitty
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Say an object of

mass = 3kg

moves down an INCLINE of a

distance = 0.4 m
In a time = .25 sec

What is the NET Force acting on the object?

I think I'm going about this with the right equations and what not...but I want to make sure...

Thanks!
 
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Well first you have to calculate the acceleration then apply to Newton's second law F=ma.
 
binahkitty said:
Say an object of

mass = 3kg

moves down an INCLINE of a

distance = 0.4 m
In a time = .25 sec

What is the NET Force acting on the object?
What is the speed at time t=0? Is it at rest?

AM
 
Assuming it starts at rest and assuming it's uniform acceleration, the acceleration would be obtained from the equation x = x0 + vt + 0.5a*t^2 (apologies, I don't know the board code for making pretty equations just yet, this is my first post). Then, as Kurdt said, you can use F = ma to work out the net force on the object. :smile:
 
binahkitty said:
I think I'm going about this with the right equations and what not...but I want to make sure...
Where's your working then?

:rolleyes:
 
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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