What are the forces acting on an object?

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The discussion focuses on the forces acting on objects, specifically a sled and a ball. It highlights that Earth's gravitational force is always present, with friction and air resistance opposing the sled's motion. For the ball, air resistance is noted, but there is confusion regarding the terminology related to "frictional force of the air" and the influence of the ball's mass. It clarifies that while the mass does not create a retarding force, it affects the net force when the ball accelerates downward. The final answers for the questions are identified as E for the sled and C for the ball.
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Homework Statement


In the attached file file.

Homework Equations


None

The Attempt at a Solution


In both cases Earth’s gravitational force always acts. For the sled, there is a force opposing the motion which can both be the frictional force between the sled and the hill and air resistance. Answer is E for the left side question. For the ball, there is air resistance. But I am not sure about the terms uses ,”frictional for of the air” “retarding force due to the mass of the ball”. Also, I don’t know if the ball’s mass intrigues its motion.
 

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There is no actual retarding force due to the mass of the ball. However, if the ball is accelerating downward, the gravitational force exceeds the air resistance force by the mass of the ball times its acceleration.
 
Chestermiller said:
There is no actual retarding force due to the mass of the ball. However, if the ball is accelerating downward, the gravitational force exceeds the air resistance force by the mass of the ball times its acceleration.
Ah, understood. So, it’s E for the left side question and C for the other one?
 
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