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State whether True or False.
(i) Work is said to be done when a force is applied, even if the object does not move.
(ii) Lifting a bucket vertically upward results in positive work done on the bucket.
(iii) The SI unit for both work and energy is joule (J).
(iv) A motionless stretched rubber band has kinetic energy.
(v) Energy can change from one form to another.
Show Answer
(i) False — work needs a displacement, not just a force.
(ii) True — force (up) and displacement (up) are in the same direction.
(iii) True — both are measured in joules.
(iv) False — a motionless stretched band has potential energy, not kinetic.
(v) True — energy can change from one form to another.
