If a stone is tied to a string and whirled in a circle, and the string suddenly breaks, the stone will: MCQ with Answer and Explanation

If a stone is tied to a string and whirled in a circle, and the string suddenly breaks, the stone will:

A. Fly off tangentially to the circular path.

B. Fly outwards radially.

C. Move inwards towards the center.

D. Fall straight down immediately due to gravity.

Answer: Option A

Solution (By JKExamLibrary)

When the stone is moving in a circle, its velocity vector is always tangential to the circle. The string provides the necessary centripetal force directed towards the center. When the string breaks, this inward force ceases to exist. Due to inertia of direction (Newton's First Law), the stone continues to move along the tangent at the point where the string broke.

This question belongs to: Science Physics

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Question #1 Report Error

According to Pascal's law, pressure applied to an enclosed fluid is transmitted

A. Only in downward direction

B. Undiminished in all directions

C. In direction of flow only

D. With loss of magnitude

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Correct Answer: Option B

Explanation:
Pascal's law: pressure applied to a confined incompressible fluid is transmitted equally and undiminished in all directions. Hydraulic lift, hydraulic brakes work on this principle. P = F₁/A₁ = F₂/A₂.

This question belongs to: Science Physics