Newton’s Laws of Motion – Video Blog Post – Emmi blk D
Newton’s First Law:
“A body continues in a state of rest or uniform motion in a straight line unless it is acted on by an external force”
In this video, the first law is shown by the ball being kicked. This shows that when the ball was at rest, it wanted to stay at rest. Then once I kicked it, it rolled, and wanted to stay rolling. But due to unbalanced forces such as friction, the ball eventually came to a stop. If there were no other forces acting on the ball itself though, then it would have kept rolling forever. The ball we used was also hollow, and very light, so it was easier to kick, but if we had used a basketball, or a bowling ball, it would have been much harder to get going, because they would have more inertia.
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Newtons second law:
“if an unbalanced force acts upon a body, the body will accelerate”
In the video, the body would be represented by the ball, which was accelerated by sarah’s foot, which would be considered the unbalanced force, or the Net Force. the video shows that when the net force acted on the body, the body accelerated. however, if the ball was as heavy as a rock, or has more mass, then it would not have accelerated as high, or as fast as the pink ball we used. when a body is accelerated it is inversely dependent on the mass of the object, but directly dependent on the unbalanced force. we found also that when sarah kicked the ball harder, it went further, but when she dropped it from higher before kicking it, the ball went higher, which also shows again how the acceleration of the body is directly dependent on the net force.
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Newton’s Third Law: “For every action, there is an equal and opposite reaction”
to demonstrate Newton’s Third Law, we took our ball and threw it towards the ground, and as a reaction, the ball came back up at an equal force. This clearly demonstrates, that for the action (throwing the ball to the ground), there was an equal, and opposite reaction. The ball, exerted a force towards the ground, and pushed itself into the Earth. The Earth, in return, pushed back on the ball, and exerted the ‘reaction’, which pushed the ball back into the air. This was also a demonstration of ‘Elastic Momentum’, where one object comes in contact with another object, and the first is bounced back. I also found that when we dropped the ball, rather than throwing it, it did not come back up with as much force.