Definition: Vector quantities possess four characteristics: point of application, direction, sense, and magnitude. Examples include velocity and displacement.

Highlight: In uniform motion, equal distances are covered in equal time intervals, and instantaneous velocity equals average velocity.

Example: The acceleration formula a = |Δv|/t demonstrates how velocity changes over time in uniformly accelerated motion.

Vocabulary: Uniform motion - motion where velocity remains constant over time.

Definition: A physical quantity is a characteristic or property of a physical body or process that can be measured and expressed using numbers and units.

Highlight: Every measurement contains an inherent uncertainty, known as measurement uncertainty. In school measurements, this is typically taken as the smallest division on the measuring instrument's scale.

Example: The formula X = Xₐᵥₑ + ΔX represents a measurement with its uncertainty.

Vocabulary: Relative motion - the concept that an object's motion depends on the chosen frame of reference.