A force of 10 N is acting on an object at an angle of 120 degrees through a distance of 4m. Calculate the work done
Correct answer: A. -20 J
- A. -20 J
- B. 20 J
- C. 40 J
- D. -40 J
Explanation
Work done is given by the formula:W = F * d * cos(theta)where:W is the work doneF is the forced is the displacementtheta is the angle between the force and displacementIn this case, we have:F = 10 Nd = 4 mtheta = 120 degreesSubstituting these values into the formula, we get:W = 10 N * 4 m * cos(120 degrees)W = -20 JTherefore, the work done is -20 J.
Last updated
About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
Practise Work and Energy
748 free Work and Energy MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.