Questions: What is the main difference between speed and velocity? Velocity includes a direction, but speed does not.

What is the main difference between speed and velocity?
Velocity includes a direction, but speed does not.

Transcript text: What is the main difference between speed and velocity? Velocity includes a direction, but speed does not.

Solution

Solution Steps

Step 1: Identify the Definitions

Speed is a scalar quantity that refers to how fast an object is moving. It does not include any information about the direction of motion. Velocity, on the other hand, is a vector quantity that includes both the speed of the object and the direction in which it is moving.

Step 2: Analyze the Options

Option 1: "Speed includes a direction, but velocity does not." This is incorrect because speed does not include direction, while velocity does.
Option 2: "Velocity is constant, but speed always changes." This is incorrect because both speed and velocity can change.
Option 3: "Velocity includes a direction, but speed does not." This is correct because velocity is a vector (includes direction) and speed is a scalar (does not include direction).
Option 4: "Speed is constant, but velocity always changes." This is incorrect because both speed and velocity can be either constant or changing.

Final Answer

\(\boxed{\text{Velocity includes a direction, but speed does not.}}\)

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