b)How much force is required to displace an object by 10 m in
the direction of applied force, if work done by the force is
800 J ?
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We know,
W = F • s
⇒ F = W/s
Displacement = 10 m
Work done = 800 J
∵ F = W/s
⇒ F = (800 J)/(10 m)
⇒ F = (800 Nm)/(10 m)
⇒ F = 80 N (answer).
More:-
ZERO/NEGATIVE/POSITIVE WORK:-
- If angle between force and displacement = 0°, then positive work is done.
- If angle between force and displacement = 90°, then work is zero.
- If angle between force and displacement = 180°, then work is negative.
Anonymous:
Hope it works
Actually, W = Fs cosθ.
I assumed angle b/w force and displacement = 0°. Since cos0° = 1, W became product of F and S.
Sorry I didn't observed. Btw, in every such cases, if direction of force and Displacement is 0°, W = Fs.
Yes; thanks for making me correct! :D
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