What are the forces acting on an object?

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SUMMARY

The discussion focuses on the forces acting on objects, specifically analyzing the gravitational force, frictional force, and air resistance. It establishes that Earth's gravitational force consistently acts on both a sled and a ball, with friction and air resistance opposing motion. The conclusion identifies the correct answers for the forces acting on the sled and the ball as E and C, respectively. The conversation clarifies misconceptions regarding the role of mass in retarding forces.

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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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