Motion Of Object Under Gravitational Force

In motion of an object under the gravitational influence of another object. Which of the following quantities is not conserved ?

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In a projectile motion, power of the gravitational force

In an elliptical orbit under gravitational force, in general

Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don't we notice such forces? Why don't the two objects in a room move towards each other due to this force?

Can two particles be in equilibrium under the action of their mutual gravitational force? Can three particle be? Can one of the three particles be?