Calculate the normal force, n, acting on a rider in an elevator if his mass is m=72.1 kg and the acceleration due to gravity g= 9.8m/s^2. the elevator has constant velocity. a) 0 n
b) 406 n
c) 707 n
d) 1008 n

Normal force,   = 707 N

Given:

Mass of the rider, M = 72.1 kg

acceleration due ti gravity, g = 9.8 m/

Velocity of the elevator is constant

Solution:

Since, the elevator is moving with a constant velocity, therefore, the frame we are dealing with is an inertial frame and will not allow any pseudo force to act on it.

The Normal force, N will now be equal to the weight, W of the body which is the product of its mass and the acceleration acting on the body due to gravity and is given by:

= W =

putting the values in the above formula

=  

= 707 N (approx)

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