Question

When a body like earth is moving in a circular path the work done in that case is zero because:

(a) Centripetal force acts in the direction of motion of the body

(b) Centripetal force acts along the radius of circular path

(c) Gravitational force acts along the radius of circular path

(d) Centrifugal force acts perpendicular to the radius of circular path
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Answer 1

$\large{\underline{\underline{\red{\sf{ Answer:}}}}}$

When a body like earth is moving in a circular path the work done in that case is zero because centripetal force along the radius of the.

$\tt{\purple{\dag Explanation:}}$

Here , in this case work is zero because the angle between the force and displacement is 90 °. since the force acts along the centre of the circular path.

${\underline{\underline{\purple{\tt{ More\:To\:Know:}}}}}$

Centripetal force and centrifugal force are equal by magnitude but their direction is opposite to each other.

mathematically both equal to product of mass and square of velocity divided by the radius of the circle.

$\large\purple{\underline{\boxed{\orange{\tt{\dag |F_{centripetal}|=|F_{centrifugal}|=\dfrac{mv^2}{r}}}}}}$

$\large\purple{\underline{\boxed{\orange{\tt{\dag F_{centripetal}=-(F_{centrifugal)}}}}}}$

Answer 2

Answer:

centripetal force acts along the radius of circular path.

Explanation: