A person of mass is standing on a weighing scale inside an elevator
PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
A person of mass 70kg is standing on a weighing scale inside an elevator. The elevator starts from rest at the ground floor and moves according to the schedule given below:
• Phase I: Accelerates upward uniformly at 2m s−2 for 4s.
• Phase II: Continues upward at constant speed for 6s.
• Phase III: Decelerates uniformly at 3m s−2 until it comes to rest at the top floor.
(i) For each phase, draw the free-body diagram of the person.
(ii) Calculate the reading of the weighing scale during each phase.
(iii) Identify the maximum and minimum readings recorded by the scale throughout the journey.