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A man with mass 81 kg lies on the floor. What is the normal force on the man?
A. 855 N
B. 794 N
C. 713 N
D. 820 N

Sagot :

Forces come in pairs, so the force of gravity (9.8 N) with the mans weight (794N) on the earth is counteracted with the normal force ( the force of the earth back on the man) which is the same
Kate200468id
[tex]F=m\cdot g\ \ \ \ \wedge\ \ \ \ g\approx9.8\ m/s^2\\ \\F\approx81\ kg\cdot9.8\ m/s^2=793.8\ \frac{kg\cdot m}{s^2} \approx794\ N\ \ \ \Rightarrow\ \ \ Ans.\ B[/tex]

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