Question

Some students want to calculate the work done by friction as an object with unknown mass moves along a straight line on a rough horizontal surface. The students have a force probe, a meterstick, and a stopwatch. Which of the following will allow lo lake the measurements needed to calculate the work done by friction?
(A) Pulling the block at an unknown constant acceleration with the force probe for a measured time.
(B) Pulling the block at an unknown constant speed with the force probe for a measured time.
(C) Pulling the block at an unknown constant acceleration with the force probe for a measured distance.
(D) Pulling the block at an unknown constant speed with the force probe for a measured distance.

Answer 1

Answer:

(C) Pulling the block at an unknown constant acceleration with the force probe for a measured distance.

Explanation:

As we know that work done is defined by the product of force and displacement

so it is given as

$W = F. d$

so here in order to find the work done we must know that force and displacement both

so we must have to pull the block with uniform acceleration and then we need to measure the distance to find the work done

so correct answer will be

(C) Pulling the block at an unknown constant acceleration with the force probe for a measured distance.