What is the work done when the force on the object is zero?

What would be the work done when the displacement of the object is zero?

An object thrown at a certain angle to the ground moves in a curved path and fails back to the ground.. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?

What is work done?

A rain drop of radius 2 mm falls from a height of 500 m above the ground. It falls with decreasing acceleration (due to viscous resistance of the air) until at half its original height, it attains its maximum (terminal) speed, and moves with uniform speed thereafter. What is the work done by the gravitational force on the drop in the first and second half of its journey? What is the work done by the resistive force in the entire journey if its speed on reaching the ground is 10 m s-^1 ?

Unit of work done

Write an expression for the work done when a force is action on an object in the direction of its displacement?

What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.

A mass of 10 kg is a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.

What is the work done by the tension of the string in a simple pendulum?

A bullet of mass 100 g strikes a wooden plank with a velocity of 300 ms^-1 and emerges with a velocity 100 ms^-1 .Calculate the work done by the resistive force on the bullet