Why don't you move anywhere while you are standing still? Why isn't your monitor randomly sliding around on the platform where it is placed? Although initially these may seem like stupid questions, in reality, they are actually quite intellegent questions answered by Newton's first law which discusses a concept known as 'inertia.' Inertia is a quantitative measure of the tendency of a body to resist change in its motion. Matter with more inertia is said to have more mass.
Newton's First Law of Motion states that "an object will maintain its current state of motion unless acted upon by an outside force." This means that unless a force, such as gravity or friction, acts upon an object that is standing still or moving at a constant velocity in a straight line, that object will continue to stand still or move at that constant velocity.
Note: This concept is also known as the Principle of Inertia.
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