ACT Science Practice Question #1511 (Medium (30)) | Test Citadel
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ACT Science Difficulty: Medium (30)

Digital ACT Science Practice Question #1511

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A 0.5 kg mass on a string rotates in a horizontal circle of radius 1.0 m at various linear velocities: - v = 2.0 m/s: Tension = 2.0 N - v = 4.0 m/s: Tension = 8.0 N - v = 6.0 m/s: Tension = 18.0 N - v = 8.0 m/s: Tension = 32.0 N According to F = m*v^2 / r, doubling velocity from 2.0 to 4.0 m/s causes tension to:
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v doubled -> F quadrupled (2.0 to 8.0 N).

Masterclass Solution & Distractor Trap Analysis

Centripetal force is proportional to v^2. (2v)^2 = 4v^2, so force quadruples: 2.0 N -> 8.0 N....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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