Physics: Center of Mass Calculation for Homogeneous Bodies
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Questions and Answers

What does Eq.(7.11) state?

  • The sum of all external forces acting on a system of particles is equal to zero
  • The centre of mass of a system of particles moves as if all the mass of the system was concentrated at the centre of mass (correct)
  • The centre of mass of a system of particles does not move
  • The sum of all internal forces acting on a system of particles

    • What does A (= dV / dt ) represent in Eq.(7.9)?

  • Force acting on the first particle
  • Acceleration of the first particle
  • Acceleration of the centre of mass of the system (correct)
  • Sum of all external forces acting on the particles

    • According to Newton’s second law, what is F1 in terms of m1 and a1?

  • $F1 = m1a1$ (correct)
  • $F1 = m1+a1$
  • $F1 = m1-a1$
  • $F1 = m1/a1$

    • What do we need to know in order to determine the motion of the centre of mass?

    <p>Only the external forces acting on the particles</p> Signup and view all the answers

    What does Eq.(7.8) differentiate with respect to time?

    <p>$dV / dt$</p> Signup and view all the answers

    What does Fext represent in Eq.(7.11)?

    <p>Sum of all external forces acting on the particles</p> Signup and view all the answers

    What is the acceleration of the first particle denoted by in Eq.(7.9)?

    <p>$dv1 / dt$</p> Signup and view all the answers

    In Eq.(7.10), what does MA represent?

    <p>$m1a1 + m2a2 +...+ mnan$</p> Signup and view all the answers

    What does Eq.(7.11) state about the motion of the centre of mass?

    <p>The sum of all external forces acting on it is equal to zero</p> Signup and view all the answers

    What does A represent in Eq.(7.9)?

    <p>Sum of all external forces acting on the particles</p> Signup and view all the answers

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