Aheterogeneous mixture is a
a. mixture in which its components retain their identity.
b. mixture in which its components can't be separated.
c. mixture that always contains water.
d. component added to sand that makes it inseparable.

The answer is A i just took the test

A- Mixture in which its components retain their identity.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on