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Hard ground can bring an object from high speed to rest in a very short period of time, while a soft object needs a long time. Why is this so? and is it true that when an object hits the ground, the action force is exerted by the ground on the object, while the force exerted by the object is the reaction force? When you are falling in the air in the case of free fall, is it true that you experience no force exerted upwards on you? Then where is the air resistance? When you are falling with parachute and are falling in terminal velocity, if you exert a force on the air, will you float upwards in the air? Will there be any parachute whose surface area is so large that when you open it when falling, you won't fall but will float upwards in the air? If body A exerts a force on body B, but the force is the maximum force body B can take, what will happen to B? In this case will B still exert an equal amount of force on A? Why some of the insects can float on water? Is it because they are too light and water can exert a force equals its weight, i.e, their weight is less than the maximum force water can exert at the surface, so they can float.
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