WAEC Physics
Which of the following statements about a moving object is correct?
a.
When accelerating, the resultant force acting on it must be equal to zero
b.
There must always be a non zero force acting on it
c.
At a steady velocity, the resultant force acting on it must be equal to zero
d.
At a steady velocity, the air resistance must be equal to zero
Correct answer: C
If an object is moving at a steady velocity, its acceleration is zero. Whenever a force acts on a body, it causes the body to accelerate. Since the acceleration of a body moving at constant velocity is zero, no force can be acting on it.