A force F is applied to a body P as shown in the diagram above....

WAEC 1990

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?

A. Fx
B. F^cosθ/_x
C. Fx tanθ
D. Fx sinθ
E. Fx cosθ

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Correct Answer: Option E

Explanation

resolving F into its components

\(F_x\) = Fcosϴ

\(F_y\) = Fsinϴ

Work done = Force x Distance = Fcosϴ \(\times\) x = Fxcosϴ

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A force F is applied to a body P as shown in the diagram above....

Correct Answer: Option E

Explanation

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