AP Physics 1 Question 108: Answer and Explanation
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8. In the laboratory, a cart experiences a single horizontal force as it moves horizontally in a straight line. Of the following data collected about this experiment, which is sufficient to determine the work done on the cart by the horizontal force?
- A. The magnitude of the force, the cart’s initial speed, and the cart’s final speed
- B. The mass of the cart and the distance the cart moved
- C. The mass of the cart, the cart’s initial speed, and the cart’s final speed
- D. The mass of the cart and the magnitude of the force
Correct Answer: C
C-The work done by the force is force times distance; but that's not an option. The other option to find work is that work done by a nonconservative force is equal to the change in an object's potential and kinetic energy. There's no potential energy change, because the surface is horizontal. The kinetic energy (mv2) change can be determined by knowing the mass and the speed change.