Sections
Section Summary

# Section Summary

• Circular motion is motion in a circular path.
• The angle of rotation $ΔθΔθ$ is defined as the ratio of the arc length to the radius of curvature.
• The arc length $ΔsΔs$ is the distance traveled along a circular path and r is the radius of curvature of the circular path.
• The angle of rotation $ΔθΔθ$ is measured in units of radians (rad), where $2π rad=360°=12π rad=360°=1$ revolution.
• Angular velocity $ωω$ is the rate of change of an angle, where a rotation $ΔθΔθ$ occurs in a time $ΔtΔt$.
• Tangential speed v and angular speed $ωω$ are related by $v=rωv=rω$, and tangential velocity has units of m/s.