If the net torque on an object is zero, its
must be zero.
Moment of inertia is biggest for:
objects that are spread out
neither; doesn’t depend on shape
Compare a ball rolling down a ramp (with
no slipping) with a block sliding down a similar ramp (with no friction). Which one
will reach the bottom first?
Ralph heard his instructor say "Moment of inertia plays the same role in
rotational motion that mass does in linear motion." This confuses him. In your own words, explain
to Ralph what that means. (I don't want
equations. I just want a short conceptual explanation.)
Mass describes how much objects resist acceleration when forces are applied.
Moment of inertia describes how much objects resist rotational acceleration when torques are applied.