Unit 5 Newton's Laws

Newton's first law of physics is that an object in motion stays in motion and an object at rest stays at rest, assuming there are no other factors affecting the object. In this picture the boy running with the soccer ball is moving at a constant velocity with the ball. If he were to trip the ball would keep rolling away, that is because the ball is an object in motion so it will continue to stay in motion. Realistically though the ball will eventually stop rolling only because of friction against the grass and other contributing factors.

Newton's second law of physics is that force equals mass times acceleration (F=ma). This equation basically represents the relationship between force and mass and acceleration. Let's say the boy in white passes the ball to the boy in blue and he kicks it into the goal. The ball has a mass and acceleration and so does the swing of the boy in blue's leg. In order to make a good kick his force must be stronger than the force of the ball that is passed to him. Lets say the soccer ball is really heavy like lead. If it were passed to the boy in blue its force would overpower the boy's kick and he would not be able to kick the ball.

Newton's final law regarding physics is that for every action there is an equal and opposite reaction. In the picture above this is represented in running. The back leg pushes back against the ground in order to push the body forward and run. Or the wind back of a leg to make a powerful kick. So whenever an object pushes another option it gets pushed back (opposite direction) with equal force.