If an object is not accelerating, how many forces act on it?

Question

1. 1

2. 3

3. Unable to determine

4. 0

5. 2

Answer 1

If the object is not accelerating, the only thing we know is that the sum of all the forces acting n it is zero. You don't know how many forces there are, what their directions are, or what their individual magnitudes are. But you DO know that they add to zero.