1. can an object be in motion and have no net force acting on it? explain?

Yes

Explanation:

We can answer this question by using Newton's second law:

where

F is the net force on an object

m is the mass of the object

a is its acceleration

Here we are considering an object which has no net force on it, so

F = 0

Therefore,

a = 0

which means that its acceleration is zero.

However, acceleration is defined as the rate of change of the velocity over time:

where v is the final velocity, u the initial velocity, t the time. If a = 0,

which means that the velocity of the object is constant. However, constant does not necessarly mean zero: therefore, if the object has no net force acting on it, we can only say that its velocity is constant, but it can be either at rest or moving.

their crystal patterns have been disrupted by stress