A toy car is on a bus floor (more information below)

Question

the bus is going to the right when it comes to a stop the toy car with frictionless wheels then moves to the right at a steady speed.

Choose One:

1. there are significant equal and opposite forces acting on the car and the net force of the toy car is = to 0
2. there are significant equal and opposite forces acting on the car but the net force of the toy car is not = 0
3. there are no significant forces acting on the toy car

I chose the the first option because I thought there still must be friction on the bus floor and since the cart is moving at a steady speed there must be equal forces acting on the cart.

Is my reasoning logical? A friend of mine chose the second option because it stated the toy car has frictionless wheels so it would not matter what the toy car traveled over.

My class recently went on break so any help would be appreciated.

Answer 1

The car going at stead speed implies that net force is 0;

that eliminates choice 2.

I don't know which forces are considered "significant".

If "significant" means non-negligible then 3. is the wrong answer and 1. is the right answer because

gravity and the normal force of the floor fit the bill.

On the other hand, if "significant" means relevant to horizontal motion

(i.e., significant = horizontal and non-zero) then 3. is a better answer than 1. because

the statement of the problem does not mention any horizontal forces.