Analyzing Motion of Ball in Strobe Diagram

AI Thread Summary
The strobe diagram indicates that the ball is moving from left to right and is slowing down. The discussion revolves around interpreting the motion, with the initial thought being that the ball is stopped. However, it is clarified that the ball is not stopped but rather experiencing deceleration, which is a form of acceleration where the speed decreases. The term "acceleration" encompasses both speeding up and slowing down, necessitating additional context to specify the nature of the motion. Understanding these concepts is crucial for accurately analyzing the ball's motion in the strobe diagram.
uwmphysics
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ok. I have to look at this strobe diagram of a ball (assuming it is moving from left to right)

o...o...o...o...o..o.oo

Which statement best describes the motion of the ball shown in the strobe diagram below? (assume the ball moves from left to right)
The ball is
a. moving with constant speed
b. speeding up
c. accelerating
d. stopped

ok from left to right it is getting slower and coming to a stop. So my first thought was that the answer is stopped. Can somebody who knows how to read these diagrams tell me if they agree?
 
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It is slowing down as you say so what describes is commonly known as the rate of change of speed?
 
accelerating-but can acceleration also be slowing down? our professor used the term decceleration but that's not listed, and its not stopped the whole time, which is why i had a hard time answering the question. Thank you!
 
Decelleration is just a term for saying the acceleration is slowing down the object rather than speeding up. Broadly speaking acceleration can mean an object is speeding up or slowing down and hence you have to have extra information to determine which such as saying decelleration.
 
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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