![]() ![]() The water tended to "keep on doing what it was doing." The container was moved from rest to a high speed at the starting line the water remained at rest and spilled onto the table. The water resisted this change in its own state of motion. ![]() The water spills whenever the state of motion of the container is changed. the container was moving in one direction and you attempted to change its direction.the container was in motion and you attempted to stop it.the container was at rest and you attempted to move it.The water would have a tendency to spill from the container during specific locations on the track. Suppose that you filled a baking dish to the rim with water and walked around an oval track making an attempt to complete a lap in the least amount of time. This concept of a balanced versus and unbalanced force will be discussed in more detail later in Lesson 1. unless acted upon by an unbalanced force." As the long as the forces are not unbalanced - that is, as long as the forces are balanced - the first law of motion applies. The condition is described by the phrase ". There is an important condition that must be met in order for the first law to be applicable to any given motion. All objects resist changes in their state of motion - they tend to "keep on doing what they're doing." The state of motion of an object is maintained as long as the object is not acted upon by an unbalanced force. If in motion with a leftward velocity of 2 m/s, they will continue in this same state of motion (2 m/s, left). If in motion with an eastward velocity of 5 m/s, they will continue in this same state of motion (5 m/s, East). If at rest, they will continue in this same state of rest. The behavior of all objects can be described by saying that objects tend to "keep on doing what they're doing" ( unless acted upon by an unbalanced force). The two parts are summarized in the following diagram. There are two clauses or parts to this statement - one that predicts the behavior of stationary objects and the other that predicts the behavior of moving objects. Newton's first law of motion is often stated as 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. The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. These three laws have become known as Newton's three laws of motion. Isaac Newton (a 17th century scientist) put forth a variety of laws that explain why objects move (or don't move) as they do. In this unit (Newton's Laws of Motion), the ways in which motion can be explained will be discussed. This is why a basketball in air, even if it doesn’t come in contact with anything, will eventually fall to the ground.In a previous chapter of study, the variety of ways by which motion can be described (words, graphs, diagrams, numbers, etc.) was discussed. ![]() Not all external forces are visible, though! Newton’s 1st Law also applies gravity and drag, which are forces that act on a ball in air even if nothing is in contact with it. A net force of zero means that the forces acting on the object cancel each other out (for example, when two equal forces act on the object in opposite directions). Keep in mind that for an object’s motion to be changed, the sum of all forces acting on the object much not be zero. It will not move until an external force acts upon it-start dribbling, or applying force, and it will be put into motion. In the above image, a ball sits on the floor, motionless. Newton’s 1st law of motion: The motion of an object is unchanged unless acted upon by a net external force. It is important for the objects around us to behave consistently, otherwise it would be much more difficult to complete basic tasks! This observation is explained in Newton’s 1st law of motion: Still chairs don’t suddenly fall over, hockey pucks don’t stop in the middle of a pass, and balls thrown in one direction won’t swerve to another. In everyday life, you probably have developed expectations for how the objects around you act. ![]()
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