Question

Suppose that the acceleration of an object is zero. Does this mean that there are no forces acting on the object? Give an example of a everyday situation

Answer 1

An object with zero acceleration (zero or constant velocity) will still have forces acting on it; normal force and force due to gravity. It is the resultant of these forces acting on the object that equal to zero, therefore, balancing out. 

A common, everyday situation would be a person in an elevator. When the elevator reaches a constant velocity, acceleration is zero, normal force and force due to gravity are balanced, which is why our bodies don't sense that we are moving up or down. When the elevator speeds up/slows down, we will then feel a resultant force; feeling heavier or lighter when acceleration is not zero. 

Hope this helps and makes sense!

Answer 2

No, if the acceleration of an object is zero, it doesn't mean that there are no forces acting on the object.

If the acceleration of an object is zero, it does not necessarily mean that there are no forces acting on such an object.

As a matter of fact, the sum of the force acting on a static body is zero that is why the body is not accelerating.

The body is not only accelerating because all the forces acting on such object has the same magnitude.

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