A force F=(5i-3j)N is applied over a particle which displaces it from its origin to the point r=(2i-1j)m. The work done on the particle is:
Correct answer: C. + 13 joules
- A. -7 joules
- B. +7 joules
- C. + 13 joules
- D. -11 joules
Explanation
Work done is given as W = F.d W= (5i - 3j) . (2i - 1j) W= 10 + 3 W= 13J
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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.
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