A man of mass 75kg investigates the motion of a lift while he stands in the lift on a bathroom scale (which is calibrated in Newtons [N],he notes three stages of his journey: (Use gravit [g] = 9.8 m.s squard). a) For 3 seconds immediately after the lift starts the bathroom scale reads 525N. b) For further 5 seconds it reads 635 N. c) For the final 3 seconds it reads 850 N. i) Is the motion of the lift upwards or downwards? Give a reason for you answer. ii) Write down the magnitude and the direction of the resultant force acting on the man for each stage (a; b; c). iii) Calculate the mag

Question

A man of mass 75kg investigates the motion of a lift while he stands in the lift on a bathroom scale (which is calibrated in Newtons [N],he notes three stages of his journey:  (Use gravit [g] = 9.8 m.s squard).  a) For 3 seconds immediately after the lift starts the bathroom scale reads 525N.  b) For further 5 seconds it reads 635 N.  c) For the final 3 seconds it reads 850 N. i) Is the motion of the lift upwards or downwards?  Give a reason for you answer.  ii) Write down the magnitude and the direction of the resultant force acting on the man for each stage (a; b; c).  iii) Calculate the mag

parthkohli · Answer

The weight of the man is $750 N$, so the meter should be reading $750N$ downwards.

parthkohli · Answer

If the acceleration is upwards, then his weight is gonna reduce as weight is downwards.

parthkohli · Answer

Or, if his weight has reduced, then the acceleration is upwards.