A gardener pushes a lawn roller by applying a horizontal force of
PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A gardener pushes a lawn roller by applying a horizontal force of 180N. The roller moves 20m along a level path in 30s.
(i) Calculate the work done by the gardener on the roller.
(ii) Determine the average power developed during this motion.
(iii) The gardener wishes to cover the same 20m in 20s but can exert a maximum horizontal force of 220N. Show by calculation whether this maximum force is sufficient to achieve the desired time.