Pseudo Force
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)
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About This Question
- Subject
- physics
- Chapter
- laws of motion
- Topic
- pseudo force
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
840 N
- Inertial Perspective: The floor must push the man up with more than his weight to create an upward acceleration.
- Newton's Law: N−mg=ma.
- Isolate Normal Force: N=m(g+a).
- Apply Values:
- N=70imes(10+2)=70×12.
- Result: N=840 N.
- Concept: The man feels an 'apparent weight' greater than his real weight because of the acceleration.
This medium difficulty physics question is from the chapter laws of motion, covering the topic of pseudo force. It appeared in the 2025 exam.
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