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# The Earth moving round the Sun in a circular orbit is acted upon by a force, and hencework must be done on the Earth by this force. Do you agree with this statement?

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The force on earth jn circular trajectory is gravity,acting radially inward...the direction of motion is tangential.....as u knw work is dot product of force and dx, the work done is zero.

Tutor

Yes indeed, work is done on earth by this force. However, if you consider the trajectory to be circular, it's zero as the dispalcemediis tangential to the force acted upon. While, the realisitic motion is elliptical, the work is indeed done on the earth by the sun.

Tutor

The force on earth jn circular trajectory is gravity,acting radially inward...the direction of motion is tangential.....as u knw work is dot product of force and dx, the work done is zero.

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Yes

Gravitationak force acts towards the centre of the earth means along the radius. So, At every point during the motion, the direction of velocity or displacement is always perndicular to the force. So the net work done is to be zero

Physics Wizard

Earth is acted upon by gravitational force which is acting inwards. Due to circular motion there is centrepetal force acting in outward direction. These two forces balance each other and since at every point in the circular orbit the forces and the displacement are perpendicular their is no work done...

Earth is acted upon by gravitational force which is acting inwards. Due to circular motion there is centrepetal force acting in outward direction. These two forces balance each other and since at every point in the circular orbit the forces and the displacement are perpendicular their is no work done by the forces

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Force and direction of motion both are perpendicular to each other so displacement is pependicular to force work will be zero.

Tutor

Not Circular Orbit,earth rounds the sun in a Elliptical Orbit,and is acted upon by a Centrifugal force .Thank you

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earth moves around the sun in elliptical orbit and centripetal force is the cause of this motion.

The force involved is gravitational which is a conservative force and as this is a motion in a closed loop it doesn't perform any work

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