pseudo force

Question

A man of mass 70 kg stands in an elevator accelerating upward at 2 m/s². What is the normal force exerted by the floor on the man? (g = 10 m/s²)

RankGuru · Accepted Answer

1. **Inertial Perspective**: The floor must push the man up with more than his weight to create an upward acceleration.
2. **Newton's Law**: $N - mg = ma$.
3. **Isolate Normal Force**: $N = m(g+a)$.
4. **Apply Values**:
   - $N = 70 	imes (10 + 2) = 70 	imes 12$.
5. **Result**: $N = 840$ N.
6. **Concept**: The man feels an 'apparent weight' greater than his real weight because of the acceleration.

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pseudo force

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