A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 joule, the angle which the force makes with the direction of motion of the body is
A man pushes a wall and fails to displace it. He does
Positive but not maximum work
No work at all
A Man moves on a straight horizontal road with a block of 2kg in his hand. If he covers a distance of 20m with constant velocity of 1m/s. Find work done by man on block during motion.
Q. A ball is connected to a rope and swung around in uniform circular motion. The tension in the rope is measured at 10 N and the radius of the circle is 1 m. How much work is done in one revolution around the circle?
- 0 (No Work)
Q. Kinetic friction can also do zero work.
Q. A block of mass m is sliding down on a fixed inclined plane with velocity of 2 m/s for a distance of 2 m. Angle of inclined plane is 35∘. Calculate the work done by normal reaction on the block.
- 0.5 mg sin35∘
- 0.5 mg cos35∘
Q. A man weighing 50 kg is walking on a horizontal surface (assumed smooth) for a distance of 1 km. What is the work done by his weight?
- Nothing can be said
Q. At the point of contact, work done by the normal reaction when a person climbs up the stairs is
- None of these
Q. An imaginery force →F=→B×→V given as the cross product of vector →B (Force field) and →V (velocity). Then the work done by the force is
- Always equal to zero
- Always less than zero
- Always greater than zero
- Can have any finite value
Q. What is work done by the force of tension(T) in the string of a simple pendulum?