Question

if the mass of the skate bored doubled but the net force on it remained constant, what would happen to the skate bored's acceleration

Answer 1

The skateboard's acceleration would decrease.

The larger the mass of an object, the more force is required to move it.

Answer 2

The skate board's acceleration would decrease. Imagine you are on a skateboard and then you pick up a heavy box on the way. The speed of your skateboard would decrease since the weight on it increased. Hope this helps.