HUMAN PHYSIOLOGY
LOCOMOTION AND MOVEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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T
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F
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Either A or B
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None of the above
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Detailed explanation-1: -As per Newton’s third law of motion, when a horse pulls a wagon, the force that causes the horse to move forward is the force the ground exerts on it.
Detailed explanation-2: -So, the movement of the horse is due to the force exerted by the ground. This force is known as friction force.
Detailed explanation-3: -The force “ground pushes horse” is the Newton’s Third Law reaction force to “horse pushes ground". These 2 forces are exactly the same size. If the horse wants the ground to push him forward, he just needs to push backwards on the ground. These two forces do not cancel because they act on different objects.
Detailed explanation-4: -When the horse pulls the wagon, it pushes the ground in the backward direction. Due to the third law of motion, the ground exerts a forward force which has the same magnitude. As the backward force applied by the wagon is weaker than the force applied by the horse, the wagon moves in the forward direction.