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?
A) An object remains at rest until a force acts on it.
B) For every action there is an equal and opposite reaction.
C) The greater the force of the water, the faster the particle accelerates.
D) The water and the particle exert a gravitational attractive force on each other.

Answer 1

particles are moved by force from water. they move faster when the force is stronger. so its C) The greater the force of the water, the faster the particle accelerates.

Answer 2

It describes the river water going faster and slower which affects the force on the sediment particles. The heavier particles settle due to smaller force from slower water. The answer is C) The greater the force of the water, the faster the particle accelerates.