The opposing force from the floor, by the way, is also why people get sore feet after a long practice session and bruised from hitting the floor after a hard dig. If the floor didn’t “push back,” athletes wouldn’t be able to leave the ground. For every action there is an equal and opposite reaction. These laws can be paraphrased as follows: A body remains at rest, or in motion at a constant speed in a straight line, unless acted upon by a force. The force exerted by their feet downwards is countered by an opposing, upwards force exerted by the floor. Newton's three laws of motionmay be stated as follows: Every object in a state of uniform motion will remain in that state of motion unless an external forceacts on it. Newton's laws of motion are three basic laws of classical mechanics that describe the relationship between the motion of an object and the forces acting on it. While most physics concepts sound complicated, they can all be broken down into simple ideas. They also help explain more complex ideas and theories in physics. These three laws connect the concepts of force, physical objects, and the resulting motion. The law of opposing forces can be seen when volleyball players leap off the floor. Newtons laws of motion are the laws of inertia, force and acceleration, and action and reaction. The faster the arm swing, the more force is exerted on a spiked volleyball at the moment of contact. Heavier athletes need more time to get into position, or more leg strength to get there as quickly. Smaller athletes are more agile on the court because their lower mass accelerates and decelerates more quickly, which is particularly critical on defense. The law of acceleration comes into play every time a volleyball player moves on the court. In an example of a moving object, a spiked volleyball moves in a fairly straight line downwards unless deflected by the force of the net, receiver’s forearms, blocker’s hands or floor. It will either fall straight down due to the force of gravity, or sail across the net from the force of a hand striking it. These laws provide an example of the breadth and simplicity of principles. Newton’s laws of motion are the foundation of dynamics. Dynamics considers the forces that affect the motion of moving objects and systems. A nice example of the law of inertia can be seen in a volleyball at the highest arc of a server’s toss, that moment when the ball is nearly motionless. The study of motion is kinematics, but kinematics only describes the way objects movetheir velocity and their acceleration.
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