Question

Unbalanced forces act on an object any time the object changes its _____ or _____.

A.) speed; strength
B.) speed; direction
C.) strength; direction

Answer 1

B.) speed; direction

Step-by-step explanation:

Anytime the speed or direction of an object changes, it is experiencing an unbalanced force. If either or both happen, the object is experiencing acceleration, a force bringing it out of equilibrium or constant velocity.
`F=ma` illustrates this idea, as whenever
`a` (acceleration) increases, then
`F` (force) will increase as well. In other words, if an object isn't experiencing an unbalanced force, then
`F_n_e_t=0`, and there are no unbalanced forces acting on it. An object will tend towards this type of motion if there is no type of force acting on it. If the object experiences a change in direction or speed, then
`F_n_e_t` ≠
`0` as it accelerates, because in order for there to be anything but constant velocity, there must be an unbalanced force acting on it. Changing speed and direction are the only types of unbalanced forces that could act on an object in terms of motion, strength is something that could only happen to an object already experiencing unbalanced forces.