Discover the Force Required to Stop an Object Instantly | Physics Refresher

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To stop an object instantly, one must consider the concept of impulse, which relates force to the change in momentum over time. Instantaneous stopping is theoretically impossible due to the infinite force required; instead, a finite time is necessary to apply a force to bring an object to rest. The discussion emphasizes that elaborating on the specific scenario can help clarify the physics involved. Understanding the principles of momentum and force is essential for solving such problems. Therefore, a detailed explanation of the situation is crucial for accurate calculations.
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Can anybody tell me how to find the force required to stop an object completely dead, instantly. It's been a long time since i last did physics, but an explanation as to how it works would also be appreciated!
 
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spanky said:
Can anybody tell me how to find the force required to stop an object completely dead, instantly. It's been a long time since i last did physics, but an explanation as to how it works would also be appreciated!
One cannot instantaneously bring an object to rest. Perhaps you could elaborate on your problem.
 
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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