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Mechanical Engineering QUESTION #2518
Question 1
The principle of work and energy for a particle states that the net work done by all forces equals:
  • The change in potential energy only
  • The change in kinetic energy: \(U_{1\to2}=\frac{1}{2}mv_2^2 - \frac{1}{2}mv_1^2\)✔️
  • The impulse of the net force
  • The product of average force and displacement
Correct Answer Explanation
Work-energy theorem: \(U_{1\to2}=T_2-T_1\), where \(T=\frac{1}{2}mv^2\) is kinetic energy. This is derived by integrating Newton's second law along the path.