Tag
Rotation
Entries tagged rotation.
4 entries
Angles, rotation, and radians
A radian measures rotation as the arc length it sweeps out divided by the radius, a definition that makes the same amount of turning read identically on any size circle.
6 min
ConceptCross product as oriented area and rotation
The cross product of two vectors is a third vector, perpendicular to both, whose length equals the area of the parallelogram they span and whose direction, fixed by a right hand convention, records the sense of rotation from the first vector to the second.
7 min
ConceptSymmetry and invariance
A symmetry is a transformation that leaves an object or a situation looking exactly the same, and whatever stays unchanged under that transformation is called invariant, a fact that can be used to shortcut a calculation rather than merely decorate its answer.
7 min
ConceptTorque and rotational effect
Torque is the turning effect of a force, set by how much force you apply, how far from the pivot, and at what angle.
7 min