![]() As the ball spins, it exerts a force on the air around it, and in turn the air causes the ball to spin in the opposite direction that the air is moving. To get an idea of how this works, imagine spinning a ball. However, the wall also exerts a force on you that is equal and opposite in direction. For example, if you push against a wall, you exert a force upon that surface. Newton’s third law thus defines force as the interaction between objects. Newton’s third law is famous for the statement that every action has an equal and opposite reaction. The Third Law Visual illustration of Newton's Third Law Furthermore, the equation can be rearranged to also mean that the acceleration of an object is equal to the force on an object divided by its mass. Basically, the equation means that the force exerted on an object is equal to its mass multiplied by its acceleration. This equation is one of the most important equations in the history of physics. The second law is famous for the equation: F=MA. Conversely, if an object is at rest, it will remain at rest until an unbalanced force acts upon it. His first law of motion, also referred to as the law of inertia, asserts that an object in motion will stay in motion unless an external force acts upon it. The Second Law Visual illustration of Newton's Second Law Car crashes are clear examples of how Newtons Laws of Motion work. An object can only accelerate if it is constantly being acted upon by a force, otherwise it will either come to a stop or continue moving at a constant rate. The first law also differentiates constant motion from acceleration/de-acceleration. In the case of the soccer ball, the initial force that causes it to move could be someone kicking it, and the force that causes it to stop would be friction from both the ground and the air. Once the soccer ball starts moving, it will remain in motion at a constant velocity unless something causes it to stop moving. For example, a soccer ball in a field will remain motionless unless something comes along and moves it. This is a rather simple observation and it is fairly intuitive. Newton’s first law states that an object will remain at rest, or in constant motion, unless acted upon by a force. The First Law Visual illustration of Newton's First Law In total, there are three laws of motion: the first law, second law, and third law. Newton first published the laws of motion in 1687, and they went on to form the basis for classical physics. Not only did he discover the force of gravity and describe it mathematically, he also devised the laws of motion, the laws that govern the movement of every object from an apple to a planet. ![]() ![]() Physics would not exist in its current form if it were not for the discoveries of Isaac Newton. ![]()
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