Precession (conceptual)
Hardphysics
A sπnning top precesses due to torque from?
Select the correct option:
Solution
Incorrect! Answer:
Gravity acting at COM with support reaction
- Tipping Torque: Consider a spinning top tilted at an angle. The force of gravity (Mg) acts at the Center of Mass (COM), and the normal reaction (N) acts at the tip.
- Couple: These two parallel and opposite forces create a torque τ=Rcm×Fg.
- Angular Momentum Response: The torque is perpendicular to the angular momentum (\uvecL) of the top. Instead of falling, \uvecL changes its horizontal orientation.
- Effect: The axis of the top traces a cone around the vertical. This motion is called precession.
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
About This Question
- Subject
- physics
- Chapter
- rotational motion
- Topic
- precession (conceptual)
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Gravity acting at COM with support reaction
- Tipping Torque: Consider a spinning top tilted at an angle. The force of gravity (Mg) acts at the Center of Mass (COM), and the normal reaction (N) acts at the tip.
- Couple: These two parallel and opposite forces create a torque τ=Rcm×Fg.
- Angular Momentum Response: The torque is perpendicular to the angular momentum (\uvecL) of the top. Instead of falling, \uvecL changes its horizontal orientation.
- Effect: The axis of the top traces a cone around the vertical. This motion is called precession.
This hard difficulty physics question is from the chapter rotational motion, covering the topic of precession (conceptual). It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse rotational motion questions on RankGuru.