Question

No work is said to be done if the angle between the directions of force and displacement is b. 90°. c. between oº and 90°. d. 180°. ​

Answer 1

ANSWER

90°

• The formula for work done when the force is applied at an angle to the direction of motion is given by,
• The formula for work done when the force is applied at an angle to the direction of motion is given by,W=FScosθ
• The formula for work done when the force is applied at an angle to the direction of motion is given by,W=FScosθWhen there will be no component of force, parallel to the direction of motion then force F in direction of motion is zero, so work done will also be zero.

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WHEN NO FORCE IS APPLIED?

• The force exerted by the person is an upward force equal to the weight of the box, and that force is perpendicular to the motion. If there is no motion in the direction of the force, then no work is done by that force.

• Negative work done – The work done is said to be negative when force and displacement are in opposite directions. Hence, work is negative. Note: Work done by friction is always zero because friction force and displacement act in opposite directions.

• Zero work is defined when force and displacement are perpendicular to one another and when force or displacement is zero.

See the images attached for better understanding