Physics
Assertion (A): When the displacement is normal to the direction of force, the work done is zero.
Reason (R): Work done depends on the angle between force and displacement.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Related Questions
The energy of electron is 2.5 eV. When expressed in Joule, it is
- 1.6 x 10-19 J
- 4.0 x 10-19 J
- 3.2 x 10-19 J
- 0
A block of mass 20 kg is pulled up a slope as shown in the figure given below with a constant speed by applying a force of 200 N parallel to the slope from the initial position A to the final position B. Work done in moving the block from A to B is:
- 600 J
- 500 J
- 60 J
- 200 J
A force F acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force.
(a) Write the expression for the work done by the force.
(b) What should be the angle between force and displacement so that the work done is (i) zero, (ii) maximum?
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force.