Question

Workdone by the gravitational force on a body of mass m moving on a smooth horizontal surface through a distance s is

Answer 1

Answer:

Work done on an object along a given direction of motion is equal to the force times the displacement times the cosine of the angle. No work is done along a direction of motion if the force is perpendicular.

distance perpendicular to force

W = f. s cos theta

theta = 90 degree

=========0

Answer 2

Work done by the gravitational force on a body of mass m moving on a smooth horizontal surface through a distance s is 0

Explanation:

The work done by the gravitational force on a body of mass m moving on a smooth horizontal surface through a distance s is given by :

$W=Fd\ cos\theta$

Here,

F is the force

d is the displacement

As we know that the force of gravity acts in downward direction. When the object of mass m moves horizontally, the angle between the force and displacement is equal to 90 degrees.

Since, cos(90) = 0

W = 0

So, the work done by the gravitational force on a body of mass m moving on a smooth horizontal surface through a distance s is 0. Hence, this is the required solution.

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