A particle is acted upon by a force of constant magnitude F while its velocity has constant magnitude v. Which values can the instantaneous power of this force take as the angle between F and v changes?
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Question

A particle is acted upon by a force of constant magnitude F while its velocity has constant magnitude v. Which values can the instantaneous power of this force take as the angle between F and v changes?

Select all that apply

G1 Physics · Accepted Answer

P=Fv cosθ and −1≤cosθ≤1. Thus power can range continuously from −Fv to +Fv, including zero, but cannot equal 2Fv.