Normal Force = Weight
Normal Force = mg = 80(9.81) = 784.8 N.
This is also true when the elevator is running at constant velocity (zero acceleration). The pressure he exerted on the floor will change when the acceleration of the elevator is not zero.
letter (b)
Reverse Effective Force, REF = ma = 80(1) = 80 N upward (Note: REF is always opposite the acceleration)
Weight = 784.8 N downward
Normal Force = 784.8 - 80 = 704.8 N
letter (c)
Reverse Effective Force, REF = ma = 80(1) = 80 N downward
Weight = 784.8 N downward
Normal Force = 784.8 + 80 = 864.8 N
Conclusion: Exercise may reduce the weight by 10 kg in less than a month. :)
Let us call the required pressure Normal Force
letter (a)
Normal Force = mg = 80(9.81) = 784.8 N.
This is also true when the elevator is running at constant velocity (zero acceleration). The pressure he exerted on the floor will change when the acceleration of the elevator is not zero.
letter (b)
Weight = 784.8 N downward
Normal Force = 784.8 - 80 = 704.8 N
letter (c)
Weight = 784.8 N downward
Normal Force = 784.8 + 80 = 864.8 N
Conclusion: Exercise may reduce the weight by 10 kg in less than a month. :)
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