Which term is defined as:  "Measures the magnitude (size) and direction?"*5 pointsSPEEDVECTORVELOCITYSCALARACCELERATIONFORCE

Step 1: Break Down the Problem

To identify the correct term that "Measures the magnitude (size) and direction", we need to analyze each of the provided options.

Step 2: Relevant Concepts

1. Speed: A scalar quantity that measures how fast an object is moving, independent of direction.
2. Vector: A mathematical entity that has both magnitude and direction; often used in physics to represent quantities like force and velocity.
3. Velocity: A vector quantity that measures the rate of change of position with respect to time, including direction.
4. Scalar: A quantity that only has magnitude, without any direction (e.g., temperature).
5. Acceleration: A vector quantity that represents the rate of change of velocity, including direction.
6. Force: A vector quantity that represents an interaction that causes a change in motion, defined by magnitude and direction.

Step 3: Analysis and Detail

• Speed does not incorporate direction.
• Scalars, by definition, do not include direction.
• Vector is a general term that includes both magnitude and direction but doesn't specifically define a specific phenomenon.
• Velocity and acceleration are specific instances of vector quantities that include direction.
• Since the question specifically asks for a term that measures both magnitude and direction, velocity is the most appropriate term because it specifically refers to speed in a given direction.

Step 4: Verify and Summarize

In context, while both velocity and acceleration are vectors, the term "velocity" directly ties magnitude (speed) with direction of travel. Therefore, it fits the definition provided in the question.

Final Answer

VELOCITY