Horizontal frictionless track?

Question

What are the forces acting on a cart that is moving along a horizontal frictionless track due to the resistive force of a garter?

Answer 1

gravity (or weight of the cart)

upward reaction force on the cart from the track (for every action, there is an opposite and equal reaction - newton's 3rd law of motion)

resistive force of a garter

air resistance (maybe it's neligible)

Answer 2

-gravity

-reaction from the track

-drag (air resistance) - unless this is taking place in a vacuum! Equally plausible along with the frictionless track! :P

-resistive force of garter

-if the cart is being propelled, then that will be a force as well, otherwise, there will be no force moving it forward - just the its inertia.

-the cart would also have its own internal friction forces in its mechanical components, for example, friction in bearings and axles