Question

in which the following case the work done by force will be maximum when the angle between the direction of force and direction of motion is 0degree or 90degree​

Answer 1

Work = Force x Displacement x cos ∅,

Where ∅ is the angle between direction of force and direction of displacement.

Obviously, we need cos  ∅ to be maximum.

The maximum value of cos ∅ is 1  when ∅ = 0°

Hence force will be maximum when the angle between the direction of force and direction of motion is 0°

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Note: For ∅=90°, no work is done by the force as cos 90° = 0.

Answer 2

Answer:

Work = Force x Displacement x cos Ø,

Where is the angle between direction of force and direction of displacement.

Obviously, we need cos to be maximum.

The maximum value of cos Øis 1 when Ø= =

0°

Hence force will be maximum when the angle between the direction of force and

direction of motion is 0°

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Thanks :-)

Note: For Ø-90°, no work is done by the force as cos 90° = 0.