Uniform Motion: Understanding Velocity Direction

In uniform circular motion, an object moves along a circular path at a constant speed. The velocity of the object is a vector quantity, meaning it has both magnitude (speed) and direction.

• Speed vs. Velocity: While the speed is constant in uniform circular motion, the direction of motion continuously changes as the object moves around the circle.
• Velocity Direction: At any point on the circular path, the direction of the object's velocity is always tangent to the circle at that specific point. This means the velocity vector is perpendicular to the radius connecting the center of the circle to the object's current position.
• Key Concept: The velocity vector indicates the instantaneous direction of travel. For circular motion, this direction is always along the tangent line.

Analyzing the Options

• Option 1 (Perpendicular to the axis of rotation): This is incorrect. The axis of rotation is perpendicular to the plane of motion. Velocity lies within the plane of motion.
• Option 2 (Along the radius, away from the center): This describes a radial direction, not the direction of motion.
• Option 3 (Tangential to the circular path): This is the correct description of the velocity's direction in uniform circular motion.
• Option 4 (Along the radius, toward the center): This describes the direction of centripetal acceleration, not velocity.

Therefore, the direction of the velocity of an object in uniform circular motion is tangential to the circular path.