WAEC - Physics (1990 - No. 9)
A force F is applied to a body P as shown in the diagram above. If the body P moves through a distance r, which of the following represents the work done?
Fx
Fcosθ/x
Fx tanθ
Fx sinθ
Fx cosθ
Vysvětlení
resolving F into its components
\(F_x\) = Fcosϴ
\(F_y\) = Fsinϴ
Work done = Force x Distance = Fcosϴ \(\times\) x = Fxcosϴ