The figure that follows shows three situations in which an external applied forc

Question

The figure that follows shows three situations in which an external applied force acts on a sled that is sliding toward the right during while each force is being applied. Assume that the sled moves the same distance in each case. Also assume that the sled experiences no frictional forces and that the magnitude of the applied force in the same in all three cases.

In which case is the work done by the applied force most positive? Most negative?

In which case does it have the greatest magnitude. Explain the reasons for your answer.

Explanation / Answer

We know, Workdone = F*d*cos(theta)

here F is Force

d is dispalcement

theta is the angle between F and d.

in case a,

Workdone, Wa = F*d*cos(90) = 0

in case b,

Workdone, Wb = F*d*cos(theta)

in case c,

Workdone, Wc = F*d*cos(180)

= -F*d

clearly, in case B, Workdone is most posictive <<<<<<------Answer

in case C, Workdone is most negative. <<<<<<------Answer

In case C, the magnitude of workdone is maximum <<<<<<------Answer

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.