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Block B slides on frictionless inclined plane of Block A. Block A also slides on frictionless ground. A rope at one end is attahed to the block B and passes over a pulley attched to block A. The other end of the rope is attached to an immovable wall. Find the relative acceleration of B w.r.t. A and acceleration of ‘A’

Block B slides on frictionless inclined plane of Block A. Block A also slides on frictionless ground. A rope at one end is attahed to the block B and passes over a pulley attched to block A. The other end of the rope is attached to an immovable wall. Find the relative acceleration of B w.r.t. A and acceleration of ‘A’

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Grade:11

1 Answers

Mallikarjun Maram
50 Points
9 years ago
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Dear Student, please see the diagram below.

 

Let,

x1 = distance of block A from wall

x2 = distance of block B from pulley

L = length of the string.

a = magnitude of acceleration of the block A with respect to ground

b = magnitude of acceleration of the block B with respect to block A

θ = angle of the inclination of the plane.

Then x1 + x2 = L

Differentiating twice with respect to time,

we get

Now from FBD of block B (from the reference frame of block A),

we have following forces acting on B,

N = normal reaction

mBg = gravitational force

mBa = pseudo force

as shown in the figure.

Writing Newton's second law along the plane, we get

mBb = mBacosθ + mBgsinθ

b = acosθ + gsinθ

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