The proof of Theorem (4/11) starts off as follows:/Die bewys van stelling (4/11)

Question

The proof of Theorem (4/11) starts off as follows:/Die bewys van stelling (4/11) begin soos volg: sigma M_P = sigma rho_i times F_i = sigma rho_i times F_i + sigma rho_i times f_i = sigma rho_i times (F_i + f_i) = sigma rho_i times m_i a_i Which one of the following statements is true?/Waiter een van die volgende bewerings is waar? The internal forces are brought into the argument in order to be able to apply Newton's second law to the particles, individually. Bringing in the internal forces in the argument is not really necessary, as the sum of the moments of all internal forces is zero. The sum of the moments of all internal forces about the arbitrary point P is not a zero vector. The last line can be interpreted as the moment of the acceleration of the system about the centre of mass.

Explanation / Answer

Option (2)

Bringing in the internal forces in the argument is not really necessary, as the sum of the moments of all internal forces is zero.

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