Q1
Work is calculated as:
AForce × displacement
BForce × time
Cmass × acceleration
DForce ÷ time
CBSEClass 9 (CBSE)ScienceCh 10 · Topic 1
Work Done by a Force
Learning the scientific definition and calculation of work.
Core concept
Work is measured in joules (J), where one joule equals one newton of force causing one metre of displacement. If the force and displacement are in the same direction, work is positive; if displacement occurs opposite to the force direction (like friction acting against motion), work done by that force is negative. This precise scientific definition of work differs from everyday usage, where 'work' might describe any effort, even without resulting movement.
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• Work (W) = Force (F) × displacement (d), only when displacement occurs in the force's direction.
• No work is done (scientifically) if there is no displacement, even with applied force.
• Work is measured in joules (J); 1 joule = 1 newton × 1 metre.
• Work can be positive (force and displacement same direction) or negative (opposite directions, like friction).