(i) Evaluate the following statements (T/F/N). As always, explain your reasoning

Question

(i) Evaluate the following statements (T/F/N). As always, explain your reasoning. (A) If you drop two objects of unequal mass, from rest, from the same height above the ground, the object with more mass will have more kinetic energy at the moment before impact. (Neglect air resistance.) (B) In an isolated system, mechanical energy is always conserved. (C) A parked car could have more mechanical energy than the same car traveling at 30 m/s. (D) A rubber band at rest must always have less mechanical energy than when it travels as a projectile toward a physics instructor. (E) The force exerted by an ideal spring is always in the negative direction. (ii) Which is a vector quantity and which is a scalar quantity? (A) k|x|. (B) Power (C) Work (D) Displacement

Explanation / Answer

he reason that two objects of different masses hit the ground at the same time is because, when an object is in free fall, it is "weightless". This is because there is no force pushing up on it whatsoever. Since both of these objects are experiencing the same force, gravitational force (that being -9.8N Fg=(9.8N/kg))*m And since the mass is non-existent in this case, the force on both of the falling objects is the same. If the force on an object is the same, they both are going to experience the same result.

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