1. What is the key feature that characterizes planar motion?
2. What is the term for a planar movement where a body turns about a fixed point or axis, with points moving along circular paths?
3. When was the concept of kinematic quantities such as displacement, velocity, and acceleration first formalized or widely published in the scientific literature?
Planar motion — definition?
Movement confined to a single plane.
Types of planar movements — examples?
Translation, rotation, and their combination.
Displacement — role?
Represents change in position as a vector.
Relative velocity — formula?
$oldsymbol{v}_{A/B} = oldsymbol{v}_A - oldsymbol{v}_B$.
Circular motion — key feature?
Movement along a circle with centripetal acceleration.
Uniform motion — characteristic?
Constant velocity, no acceleration.
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