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JEE · Physics · Rotational Motion doubts
8 doubts found
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JEEPhysicseasy
What does “Centre of mass” actually mean in Rotational Motion, and why does it matter for JEE?
the single point where the whole mass of a system can be treated as concentrated.
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JEEPhysicsmedium
I keep getting “Centre of mass” questions wrong in Rotational Motion. What's the trap?
assuming it always lies inside the body (for a ring it's at the empty centre).
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JEEPhysicseasy
What does “Torque” actually mean in Rotational Motion, and why does it matter for JEE?
the turning effect of a force, τ = r×F = rF·sinθ — the rotational analogue of force.
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JEEPhysicsmedium
I keep getting “Torque” questions wrong in Rotational Motion. What's the trap?
using the force alone instead of force times perpendicular (lever-arm) distance.
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JEEPhysicseasy
What does “Moment of inertia” actually mean in Rotational Motion, and why does it matter for JEE?
the rotational analogue of mass; it depends on both the mass and how it is distributed about the axis.
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JEEPhysicsmedium
I keep getting “Moment of inertia” questions wrong in Rotational Motion. What's the trap?
treating it as a fixed property regardless of the axis chosen.
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JEEPhysicseasy
What does “Angular momentum” actually mean in Rotational Motion, and why does it matter for JEE?
L = Iω, conserved when the net external torque is zero.
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JEEPhysicsmedium
I keep getting “Angular momentum” questions wrong in Rotational Motion. What's the trap?
forgetting that pulling mass inward lowers I and therefore speeds up rotation.
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