Newton's Second Law (Translational Dynamics)

AP Physics 1· difficulty 2/5

Two blocks (m1,m2m_1, m_2) connected by a string over an ideal pulley have system acceleration aa (m1>m2m_1 > m_2, hanging). The <strong>net external</strong> force on the system (considering both blocks together) is

  • A

    m1g+m2gm_1 g + m_2 g

  • B

    m1gm2gm_1 g - m_2 g

    check_circle
  • C

    (m1m2)a(m_1 - m_2)\,a

  • D

    00

Explanation

Net force on the system equals the <strong>difference</strong> of gravity forces; tension is internal. Fnet=(m1m2)gF_\text{net} = (m_1 - m_2) g.

Want 10 more like this — adaptive to your weak spots?

Related questions