When a body moves in a circle, the angle between its linear velocity and angular velocity is always:
Correct answer: D. 90°
- A. 0°
- B. 180°
- C. 360°
- D. 90°
Explanation
This is the correct answer. When a body moves in a circle, the angle between its linear velocity and angular velocity is always 90°. The linear velocity is tangential to the circle (in the direction of motion), while the angular velocity is directed radially, from the center of the circle outward. These two directions are perpendicular to each other, resulting in a 90° angle.
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About Angular and Linear Quantities
Rotational motion relates angular displacement, angular velocity and angular acceleration to linear displacement, tangential velocity and tangential acceleration through the radius. Questions use radians, v equals r omega and tangential acceleration, while distinguishing tangential velocity from centripetal acceleration and angular quantities from their linear counterparts.
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