Margarita is on a hike when she crosses the stream the movement of her legs in the water gets more difficult as the water gets deeper what part of newtons law of motion explains the increased ease of the moving trolley
The increased ease of the moving trolley can be explained by Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In this case, Margarita is pushing against the water with her legs. As the water gets deeper, the water exerts a greater upward force on Margarita's legs, which provides an increased support or buoyancy. This upward force counteracts the force of gravity acting on her legs, making it easier for her to move through the water.
It seems there is a confusion in the question. The initial part of the question states that Margarita is on a hike and crosses a stream, whereas the latter part mentions a moving trolley. To clarify, Newton's laws of motion explain the motion of objects, including how forces affect their motion. However, it is not clear how the increased ease of moving a trolley relates to Margarita crossing a stream. Could you please provide more details or clarify the question?
Newton's Law of Motion that explains the increased ease of the moving trolley as the water gets deeper is the "Law of Buoyancy."
The Law of Buoyancy is a principle formulated by Archimedes, which states that the buoyant force acting on an object submerged in a fluid (such as water) is equal to the weight of the displaced fluid. In other words, when an object is partially or fully submerged in a fluid, it experiences an upward force called the buoyant force, which counteracts the force of gravity.
In the case of Margarita's legs in the water, as the water gets deeper, the buoyant force acting on her legs increases. This is because her legs displace a larger volume of water as they go deeper into the stream. With a greater volume of water being displaced, the buoyant force exerted on her legs also increases according to the Law of Buoyancy.
This increase in the buoyant force helps to offset the force of gravity acting on her legs, making it easier for her to move them through the water. Essentially, the buoyant force acts as a lifting force, reducing the effective weight of her legs, and allowing her to move with greater ease despite the deeper water.