Question:
A block of mass $m$ is placed on a smooth wedge of inclination $\theta$. The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block will be ($g$ is acceleration due to gravity)
A block of mass $m$ is placed on a smooth wedge of inclination $\theta$. The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block will be ($g$ is acceleration due to gravity)
Updated On: May 4, 2024
- $mg \cos \theta;$
- $mg \sin\theta;$
- mg
- $\frac {mg} {cos\, \theta}$
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The Correct Option is D
Solution and Explanation
The wedge is given an acceleration to the left.
$\therefore$ The block has a pseudo acceleration to the right, pressing against the wedge because of which the block is not moving.
$\therefore mg\,\sin\,\theta=ma \,\cos\,\theta$ or $a=\frac{g\,\sin\,\theta}{\cos\,\theta}$
Total reaction of the wedge on the block is
$N=mg \,\cos\,\theta+ma \,\sin\,\theta$.
or $N=mg\,\cos\, \theta+\frac{mg\,\sin\,\theta \cdot \sin\,\theta}{\cos\,\theta}$.
$N=\frac{mg(\cos^2 \,\theta+\sin^2\,\theta)}{\cos\,\theta}=\frac{mg}{\cos\,\theta}$
$\therefore$ The block has a pseudo acceleration to the right, pressing against the wedge because of which the block is not moving.
$\therefore mg\,\sin\,\theta=ma \,\cos\,\theta$ or $a=\frac{g\,\sin\,\theta}{\cos\,\theta}$
Total reaction of the wedge on the block is
$N=mg \,\cos\,\theta+ma \,\sin\,\theta$.
or $N=mg\,\cos\, \theta+\frac{mg\,\sin\,\theta \cdot \sin\,\theta}{\cos\,\theta}$.
$N=\frac{mg(\cos^2 \,\theta+\sin^2\,\theta)}{\cos\,\theta}=\frac{mg}{\cos\,\theta}$
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Concepts Used:
Laws of Motion
The laws of motion, which are the keystone of classical mechanics, are three statements that defined the relationships between the forces acting on a body and its motion. They were first disclosed by English physicist and mathematician Isaac Newton.
Newton’s First Law of Motion
Newton’s 1st law states that a body at rest or uniform motion will continue to be at rest or uniform motion until and unless a net external force acts on it.
Newton’s Second Law of Motion
Newton's 2nd law of motion deals with the relation between force and acceleration. According to the second law of motion, the acceleration of an object as built by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Newton’s Third Law of Motion
Newton's 3rd law of motion states when a body applies a force on another body that there is an equal and opposite reaction for every action.