Newton's Second Law (Translational Dynamics)

AP Physics 1· difficulty 2/5

Three identical 2 kg2~\text{kg} blocks connected in a row by light strings on a frictionless surface are pulled by a 24 N24~\text{N} force on the front block. What is the tension in the string between the middle and rearmost blocks?

  • A

    8 N8~\text{N}

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  • B

    4 N4~\text{N}

  • C

    16 N16~\text{N}

  • D

    24 N24~\text{N}

Explanation

System: a=24/(32)=4 m/s2a = 24/(3 \cdot 2) = 4~\text{m/s}^2. The rear string only pulls the rear block: T=ma=(2)(4)=8 NT = m a = (2)(4) = 8~\text{N}.

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