ΣF=ma_c (sum of forces equals mass times centripetal acceleration)
Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
This equation represents Newton's second law applied to circular motion. It states that the sum of all forces acting on an object moving in a circle is equal to the mass of the object multiplied by its centripetal acceleration.
Centripetal acceleration refers to the acceleration experienced by an object moving in a circular path. It always points towards the center of the circle.
Tangential velocity is the linear speed at which an object moves along its circular path tangent to that point. It is perpendicular to both centripetal force and centripetal acceleration.
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