Hobbies And Interests
Force on Water
You can use water to visualize the law of inertia. A cup of water sitting still will not move. If you apply force to the cup, the water wants to remain still because the force is being applied to the cup, not the water; the water spills due to the moving cup. If a force was already applied to a glass of water and the water was in motion and forced to stop, the water would continue in motion and spill out of the cup.
Static Force
Static force is what must be overcome before a body at rest can move. For instance, swimming in water explains static force. The static force is the drag you feel when you push off of the side or bottom of a pool right before your body begins to move.
Dynamic Force
Dynamic force occurs when a body already in motion wants to stay in motion. For instance, swimming in water becomes a fluid movement once the static force is overcome. Dynamic force would keep you moving and moving; however, the drag pulls the body to a slowing stop. Water has low resistance to force and takes time and drag to stop the body in motion.
Newton's Second Law of Motion and Water
Newton's second law of motion explains how objects with the same mass but different forces move different distances. A body or object with a smaller mass and greater force will move further. In water, if two bodies push off of a wall, the body that produced the greatest overall force will go further.
Newton's Third Law of Motion and Water
Newton's third law of motion states that for each action there is an equal and opposite reaction. In water, if you are swimming and you pull water down along your side to perform a breast stroke, the water moves toward your feet as you move forward. The action of moving your arm in the water causes a reaction of water pushing back on you, resulting in forward movement.