
#1
Dec3112, 08:31 PM

P: 28

*I am reposting as I previously posted this in the wrong category.
1. The problem statement, all variables and given/known data Perhaps I am confused by the concept. A toy car starts from rest at a height 4R above the ground and continue to a loop of radius R (frictionless). At a point C (height R from the ground) inside the loop, what is the tangential acceleration of the toy car? 2. Relevant equations I don't think a=alpha*r is quite relevant to this...or a=dv/dt... 3. The attempt at a solution not quite yet. perhaps the gravity is the only thing? Please, explain me of the concept of 'tangential acceleration' and its components. 



#2
Dec3112, 09:25 PM

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#3
Jan113, 12:57 AM

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Do you have a diagram to the question that you can attach?




#4
Jan113, 04:29 AM

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Tangential Acceleration
hi heartyface!
to add to what SammyS has said … (yes, it really is that simple! ) 



#5
Jan113, 10:38 AM

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Mr. Warlock here it is Tiny Tim really? how would I use such equations in this problem? 



#6
Jan113, 12:14 PM

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Draw a free body diagram for the car at point C. What force besides gravity, if any, is acting in the vertical direction, on the car at point C ? 



#7
Jan113, 01:23 PM

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(and force is physics, and gravity is a force) so differentiate to find α, then multiply by R 



#8
Jan113, 01:45 PM

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I see, thanks guys, but what if
? What will the tangential acceleration be at each points? At C, it is mere g acting against the motion of the car At A, it is g acting in favor of the motion of the car. However, and B and D, g is not in the direction in the tangential motion does that mean there is no tangential acceleration at points B and D? 



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Jan113, 02:50 PM

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#10
Jan113, 03:12 PM

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^ I see, that clears it up. thanks Sammy :)



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