# Examples of Law of Inertia in Sports

The law of inertia is easily recognizable and applicable in all kinds of situations, including sports. Inertia keeps an object in a straight line at constant speed, or a stationary object at rest. This concept applies to most sports and is crucial to understanding sports movements and techniques. In gymnastics, athletes are constantly changing their body configuration. By increasing the radius of the axis of rotation, the moment of inertia increases and thus slows down the speed of rotation. Newton`s first law, also known as the law of inertia, states that unless affected by a force, a motionless body remains motionless or a moving body continues to move. Newton`s second law of acceleration states that an increase in the velocity of a moving object is directly proportional to the force exerted and inversely proportional to the mass of the object. The third law, the law of action and reaction, states that when one object exerts force on another object, the latter reacts with equal force in the opposite direction. On the Earth`s surface, inertia is often masked by gravity and the effects of friction and drag, both of which tend to reduce the speed of moving objects (usually to the point of rest). This led the philosopher Aristotle to believe that objects would only move as long as force was exerted on them. Divers always strive to complete the required number of somersaults and/or turns as quickly as possible so that they have more time to prepare to enter the water. To do this, they must increase their angular velocity and thus reduce their moment of inertia.

This is done by changing their body configuration to reduce the distance between the center of mass of each body segment and the axis of rotation, so that a narrower pike position gives the diver a lower moment of inertia and greater angular velocity. As soon as the diver leaves the board, there is no more torque on the body. This means that angular momentum is maintained if no external torque acts on it, so that when the moment of inertia decreases, the angular velocity increases and vice versa. Conclusion: Sport is associated with physics until the end. Understanding the science behind sport can lead to athletes` improvement, such as running faster and swimming farther. However, achieving goals in sport is not only a matter of science, but also many other factors. For example, physical ability, natural talent, perseverance and courage. Therefore, diligence and perseverance are the most important attitudes to succeed. Newton`s first law of motion: A body remains at rest or moves at a constant speed, unless it is affected by a force (law of inertia). Moments of inertia were found for a backward dive and a forward dive by calculating the sum of inertia for each body segment.

Both dives were performed by the same diver, but the moments of inertia are due to the distance of each segment from the axis of rotation, i.e. the hip, different for both dives and the differences in angular velocity during the dives. Create your free account and try the virtual mechanical labs that explain Newton`s laws of motion and laws of inertia. A fine example of the law of inertia can be seen in a volleyball in the highest arc of a server`s throw, the moment when the ball is almost motionless. He will fall directly due to gravity or cross the net by the force of a hand that he will hit. In an example of a moving object, a spiny volleyball moves downward in a fairly straight line unless it is deflected by the force of the net, the catcher`s forearms, the blocker`s hands, or the ground. Introduction The moment of inertia of an object is an indication of the force that must be applied to move or keep the object moving around a defined axis of rotation. The moment of inertia, which is a derivative of Newton`s second law, is sometimes called the second moment of mass and can be calculated using the equation: if an athlete wants to increase the rotational speed, he must decrease the radius by bringing the body segments closer to the axis of rotation, thus reducing the radius and moment of inertia. It is clear from Newton`s first law of motion that a body tends to remain at rest or in regular motion.

This property of the body is called inertia. Inertia is therefore the property of a body that allows it to resist or resist any change in its state of rest or its uniform movement. This is also known as the “law of inertia” and means that something remains still or moves unless a force acts on it. For example, a golf ball remains stationary unless a force applied by the golf club moves it. Or the same golf ball will continue to move at a constant speed unless a force acts on it to slow it down (e.g., wind resistance) or change direction (e.g., gravity). Here`s a funny thought: The next time you see the fast-paced action of a volleyball match, consider how many laws of physics are demonstrated on the field. For example, each movement of the ball or athletes illustrates one of Newton`s three laws of motion: inertia, acceleration, and response to action. Applying the principles of physics to sport is more than just an interesting mathematical problem. These analyses form the basis of biomechanics and sports science and can be used to improve athletic performance. That is, massive objects had more inertia than lighter objects. For example, the mass of a stone is greater than the mass of a rubber ball for the same size.

Therefore, the inertia of the stone is greater than that of a rubber bullet. Inertial mass is a measure of an object`s tendency to resist acceleration. The more mass something has, the more it resists acceleration. One of the good examples of the law of inertia in everyday life is that the body of a player who sprints quickly across the field tends to want to maintain this movement unless the muscular forces can overcome this inertia. The angular momentum of an object rotating around an axis is a measure of the rotation of that object when no external torque acts on it, where torque is defined as a moment of force and is a measure of the force needed to cause an object to rotate. The angular momentum is a conserved quantity, which means that it remains constant unless the outer torques act on it, and is the product of the moment of inertia multiplied by the angular velocity. If the body has a larger radius, that is, during the initial and final phases of a dive, the moment of inertia is large and the angular velocity is low. In the pike position, the radius of the body decreases as each segment approaches the axis of rotation, resulting in an increase in angular velocity and a decrease in the moment of inertia.