A constant force of l0N is applied in horizontal direction and distance travelled in the direction of force is 2m, then work done is
Correct answer: B. 20 J
- A. 50 J
- B. 20 J
- C. 22 J
- D. 10 J
Explanation
Work, if found by the force applied in the direction of movement, times the distance moved, so 10N x 2m = 20J. To calculate the work done, we need to know the direction of the force. If the force is applied in the same direction as the displacement, the work done isWork = Force x Distance x cos(theta)where F is the magnitude of the force, d is the distance traveled, and theta is the angle between the force and the displacement vectors.As the force is applied in the same direction as the displacement (i.e., theta = 0), the work done is:Work = 10 N x 2 m x cos(0) = 20 JoulesSo the work done is 20 Joules.
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About Work
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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