At a particular instant in circular motion, ω = 0 but α ≠ 0. Which statements are correct at that instant?
Select all that apply

Question

At a particular instant in circular motion, ω = 0 but α ≠ 0. Which statements are correct at that instant?

G1 Physics · Accepted Answer

Speed is v=Rω, so v=0. Radial acceleration a_c=Rω² is also zero. Tangential acceleration is aₜ=Rα, which is non-zero because α≠0. Hence the total acceleration equals the tangential acceleration and is not zero.