Chapter 5119Q5.16The tension in the rope when pulling the car is twice that in the tug-of-war. One could consider thecar as behaving like another team of twenty more people.Q5.17This statement contradicts Newton’s 3rd law. The force that the locomotive exerted on the wall isthe same as that exerted by the wall on the locomotive. The wall temporarily exerted on thelocomotive a force greater than the force that the wall could exert without breaking.Q5.18The sack of sand moves up with the athlete, regardless of how quickly the athlete climbs. Since theathlete and the sack of sand have the same weight, the acceleration of the system must be zero.Q5.19The resultant force doesn’t always add to zero. If it did, nothing could ever accelerate. If we choose asingle object as our system, action and reaction forces can never add to zero, as they act on differentobjects.Q5.20An object cannot exert a force on itself. If it could, then objects would be able to acceleratethemselves, without interacting with the environment. You cannot lift yourself by tugging on your
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