A ball rolling down a slope

[GreenTea09]

neglecting friction from the slope and air resistance,
what are the possible forces acting on the ball?

i can only think of 2:
gravitational force by the Earth on the ball.
normal force exerted by the slope on the ball.

are there any other forces else that i missed out?

 

[Doc Al]

Sounds like that's about it.

Of course, if the ball is rolling down the slope, there is usually friction involved. (Else it would just slide.)

 

[lasix]

neglecting friction from the slope and air resistance,
what are the possible forces acting on the ball?

i can only think of 2:
gravitational force by the Earth on the ball.
normal force exerted by the slope on the ball.

are there any other forces else that i missed out?

In ideal conditions you are correct.

Real world: Energy transfer/inefficiencies would include mechanical to heat, sound, if hitting some rocks (sparks) light... if it's a metal ball passing over any magnets in the ground, electric.