A block is placed on a plank which is placed on a horizonta…

Physics Work, Energy, Power and Collision Mix MCQ (Single Correct)

A block is placed on a plank which is placed on a horizontal plane. A massless but elastic string deviates by an angle θ θ with vertical when a force F is applied to the plank to shift it to the right making the block slide over it. If F P and F B are frictional forces between plank and plane and between block and plane respectively then work done by applied force is given by

Work done against friction acting on plank + energy in the elastic string - work done by friction acting on block.

Work done against frictions acting on plank and block + elastic energy.

Elastic energy of string.

Difference of work done against friction acting on plank and block.

Text Solution

Verified by Experts

The correct answer is:

When plank is moved, the string is under tension. Work done by force F tries to neutralize the frictional force of plank and elongation of the string due to non-sliding of the block due to its friction. Thus, work done by F is equivalent to option .

Prepare Smarter with CGP Edu

Get practice questions, solutions, and test series in one place.

Write a Review

Share your experience with this question and solution.

Commentary

Send your comment, doubt, correction, or feedback to admin.

Student Reviews

What students say about this solution

No reviews yet. Be the first to write a review.

Share this question

Text Solution

Prepare Smarter with CGP Edu

Write a Review

Commentary

Student Reviews

Similar Questions