If force is F = 4i -2j and displacement is d = 3i + 4j, the work done will be,
Correct answer: A. 4 J
- A. 4 J
- B. 8 J
- C. 2 J
- D. 12 J
Explanation
The work done by force can be calculated by: Force x Displacement in the direction of the force (F x d). Since work done is scalar, using the scalar product, = (4i-2j) (3i+4j). = (4x3)i - (2x4)j. = 12-8. = "4 J".
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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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