Newton's Law of Motion
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Another way of stating this is that if the resultant force on a free body is zero then the object will move at a constant speed in a straight line. This speed may be zero.
Another way of stating this is that if the forces on a free body are balanced, then it will be stationary or moving with a constant velocity.
Newton's 2nd Law of Motion:
If an unbalanced force acts on a free object, it will be accelerated in the direction of the force with an acceleration which is proportional to the size of the unbalanced force.
Another way of stating this is that if the resultant force on a free body is greater than zero than the object will change its speed or direction or both.
Newton's 3rd Law of Motion:
For every action there is an equal and opposite reaction force. The reaction force results from the action force. The action force acts on one object, and the the reaction force acts on a different object.