A particle is moving counterclockwise on a circle but its speed is decreasing. Which statements are correct?
Select all that apply

Question

A particle is moving counterclockwise on a circle but its speed is decreasing. Which statements are correct?

G1 Physics · Accepted Answer

Counterclockwise motion means angular velocity is counterclockwise. Since speed is decreasing, angular acceleration is opposite to angular velocity, hence clockwise. Tangential acceleration is opposite to the velocity. Radial acceleration points toward the centre and is perpendicular to velocity, not opposite to it.