Question
Which are true 1. a rigid body undergoing planar motion is pinned at the center of...
Which are true
1. a rigid body undergoing planar motion is pinned at the center of mass in the plane of motion; all non-CM points on the rigid body have the same angular velocity.
2. When a rigid body undergoes planar motion the body center of mass remains in a singular plane.
3. The normal force is never perpendicular to the surfaces that applies the normal force.
4. Mass moment of inertia of a rigid body indicates the magnitude of effort required to speed or slow down the rigid body.
Answers
1. false
planar motion is a motion parallel to plane . it can be rotation translation or both. centre of mass also maybe moving
2. true . not just centre of mass ,plane followed by each point remains unchanged
3.true (in the case of rotation),torque = moment of inertia x angular acceleration
troque is the effort to change angular speed
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