Question

Moving water, like that of a river, carries sediment as it moves along its bed. The faster the water flows, the more sediment that is carried and the larger the sediment particles. As the river slows down, the heavier particles of the load will settle out. How can you explain the particle movement based on Newton's laws of motion?

Answer 1

well newton's law is esstenaily how gravity works. so the force in this case water moves, the more the object (sediment) will go farther. And when the force is lessened the object will eventually come to a dead stop. 

Answer 2

To understand the solution we must know about Newton's laws of motion.

What are Newton's laws of motion?

Newton's First law of motion (or the law of inertia)

If a particle is in motion it will be in motion and if an object is at rest then it will be at rest until and unless an external force is acting upon the system.

Newton's Second law of motion, F = ma

The force is the product of the mass of the object and the acceleration of the object.

Newton's Third law of motion,

When two bodies interact then the force applied by them on each other is equal in magnitude and opposite in direction.

Why does the sediment in river water move?

When the water is moving at a high speed it exerts more force on the sediments in the larger sediment therefore, it's easier to move the larger sediment particles as the force by the river water is strong enough to encounter the inertia and the gravitational force.

In the opposite case, when the river slows down, the larger sediment of the load will settle out because of the reduced force. the force applied by the river water is not enough to move the particle (or encounter the inertia and the gravitational force).

Learn more about Newton's laws of motion:

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