Displacement in the direction opposite to the Force
Displacement in the direction opposite to the Force
Displacement in the direction opposite to the force: In certain cases, the displacement of an object may be in the direction opposite to the direction of the force acting on it. If the force acting on an object and its displacement are in opposite directions, the work done by the force on the object is
W = - F x s, where F is the force and s is the displacement of the object.
When Displacement is opposite the force | Work done = (Force × displacement)= Fcos (Here |
Examples :
1. When brakes are applied to a moving vehicle, the work done by the braking force is negative. This is because the braking force and the displacement act in opposite directions.
2. When a spring is compressed than the force applied by the spring and the displacement will be in opposite to each other, so work done by spring will be negative.
The work done by the weight of a 1 kg mass while it moves up through 1 m is | |||
| Right Option : B | |||
| View Explanation | |||
A porter with a suitcase on his head is climbing up a flight of stairs with a uniform speed. The work done by the weight of the suitcase on the suitcase is | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct : (a) When a spring is compressed than the force applied by the spring and the displacement will be in opposite to each other, so work done by spring will be negative. (b) When brakes are applied to a moving vehicle, the work done by the braking force is negative. This is because the braking force and the displacement act in opposite directions. (c) When a spring is compressed than the force applied by the spring and the displacement will be in same to each other, so work done by spring will be positive. | |||
| Right Option : A | |||
| View Explanation | |||
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