Question

If you decrease or increase the mass of an object, does the force exerted by Earth (force of gravity) change as well?

Answer 1

Also, for example, say we have accelerating fan cart on a track, if we add more mass to the cart, does the force exerted by the track change? What about the force exerted by the wind (from the fan)?

Answer 2

I said for the original question: Because the cart now has more mass, the Earth exerts a greater force on it.

Answer 3

Yes, if there's more mass, the gravitation force will be more. For the cart question, I don't know if those particular forces change. I think overall the force isn't constant and you have to consider the change in momentum

Answer 4

Alright, thank you. Would it help if you had this information? "The fan cart (mass 0.683 kg) was once again accelerated down the track by moving air, which exerted a force of 0.34 N on the cart. This time, however, an unknown mass was added to the cart. [...]"