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maheshmeghwal9
Group Title
In the arrangement shown in Fig. 1.24 the masses m of the bar and M of the wedge, as well as the wedge angle alpha , are known.The masses of the pulley and the thread are negligible. The friction is absent. Find the acceleration of the wedge M.
 2 years ago
 2 years ago
maheshmeghwal9 Group Title
In the arrangement shown in Fig. 1.24 the masses m of the bar and M of the wedge, as well as the wedge angle alpha , are known.The masses of the pulley and the thread are negligible. The friction is absent. Find the acceleration of the wedge M.
 2 years ago
 2 years ago

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maheshmeghwal9 Group TitleBest ResponseYou've already chosen the best response.0
Answer is \[\LARGE{\color{blue}{a=\frac{mg \sin \alpha }{M+2m(1\cos \alpha)}.}}\]\[\color{red}{\text{But how to get this answer?}}\]
 2 years ago

VincentLyon.Fr Group TitleBest ResponseYou've already chosen the best response.0
Let x, v and a be displacement, velocity and acceleration of wedge. All these values are positive (to the right). Velocity of m wrt wedge is (first line xcomponent, second line ycomponent) v cosα v sinα Velocity of wedge wrt ground is: v 0 Adding them up gives velocity of m wrt ground: v (1 – cosα) v sinα KE of wedge is KE1 = ½ M v² KE of mass is KE2 = ½ m v² [(1  cosα)² + sin²α] = m v² (1 cosα) Altitude of m above ground is x sinα , as it goes x down along the inclined when wedge moves of x. PE of mass is PE = m g x sinα The system is conservative. So total energy is conserved. Adding up all derivatives of above energies must give zero: 0 = Mva +2mva(1  cosα)  mg v sinα Simplifying by v and solving for a leads to the solution.
 one year ago

VincentLyon.Fr Group TitleBest ResponseYou've already chosen the best response.0
* altitude above ground is actually x sinα + H where H is height of the pulley. H disappears in the derivation.
 one year ago

VincentLyon.Fr Group TitleBest ResponseYou've already chosen the best response.0
I also have a solution based on forces and N's laws, although I prefer the more global energy approach.
 one year ago

yrelhan4 Group TitleBest ResponseYou've already chosen the best response.0
also sir, what would be the displacement of the wedge? this is a common question, but i always end up getting stuck. @VincentLyon.Fr
 one year ago
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