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the awesome version of newton's laws of motion
Transcript of the awesome version of newton's laws of motion
"An object at rest tends to stay at rest, and an object in motion tends to stay in motion, with the same direction and speed. An object's motion cannot change without an unbalanced force acting on the object." Newton's 2nd Law When a force acts on a mass, the mass will speed up or slow down. The greater the mass of the object, the greater the amount of force needed to move the object. For every action force, there is an equal and opposite re-action force. A system is an imaginary circle drawn around whatever object in the universe that you care about in your specific problem. Everything outside the system is the surroundings. Technically, Newton's 1st law of motion is "If an object experiences no net force, then its velocity is constant: the object is either at rest (if its velocity is zero), or it moves in a straight line with constant speed (if its velocity is nonzero)." But who knows what that means? http://www.physics4kids.com/files/motion_laws.html So what do all these strange terms mean? Well, they mean exactly what they sound like they mean. Everyone knows what a force is, just a push or pull. Unbalanced forces are just that, forces out of balance. Think of force on an object as an arrow pushing against it. The arrow is unbalanced right? According to Newton's 1st law, this object will speed up. Now, the forces are balanced. This object will not speed up. Simple. Newton's 1st law is also known as the law of Inertia. You may be wondering why, if objects in motion always stay in motion, everyday moving objects, like a rolling ball, slow down, even when no one touches them. It seems like there is no unbalanced force to stop it, but there is. It's called friction. Friction is an unbalanced force, so it slows down the motion of sliding objects. However, if one force is bigger than the other, the forces are no longer balanced, and the object WILL speed up. For those of you wondering what Inertia is, it is Newton's 1st law, but the term itself can also be defined as 'A masses resistance to accelerate'. For example... FYI, mass is the measure of how much space something takes up. For example, a car has a greater mass than a baseball. A mass is basically an object. The acceleration a of a body is parallel and directly proportional to the net force F acting on the body, is in the direction of the net force, and is inversely proportional to the mass m of the body, i.e., F = ma.
Once again. Pretty sure no one but Newton knows whats going on there. The object on the left has greater mass than the one on the right. Therefore, left penguin is harder to move than right penguin. This law gives us a relationship between force, mass, and acceleration. To show this relationship, Newton used math, expressing his idea as an equation. F=ma force equals mass times acceleration This means that as, say, the mass of an object is increased, the force needed to produce the same acceleration will also have to increase. Or, if the force on an object is increased, in order to produce the same acceleration, mass also needs to be increased as well. Acceleration is a change in an object's velocity. Velocity is an objects speed or direction. Which means, acceleration is a change in an object speed or direction. m F M F Although I don't exactly understand the concept, in his law, Newton is saying that all forces are balanced. That the action and reaction forces balance each other. But doesn't that mean there is no acceleration? Yes. Because there are no unbalanced forces, there can be no acceleration. But, acceleration still exists. Understanding of this law can be achieved by the understanding of the concept of systems and how they interact with their surroundings. For example, when you hit someone, this is an action force. Their natural response is to hit you back. Reaction force. But, lets not use Newton's 3rd law as an excuse to hit people. i.e, All forces come in pairs. In this case, the penguin is the system. One internal force pair in this case is the wing on the penguin and the penguin on the wing. Balanced. An external force pair is Meredith pushing the snow for a snowman, and the snow pushing on her. Also balanced. Neither force pair affects the acceleration of the system. Within the system there are balanced force pairs, called internal forces. Outside the system, other force pairs are occurring. These are called external forces. In both cases, the system is not accelerating. But, when there is an interactive force, suddenly, the pair is unbalanced, and acceleration occurs. In this system however, one force is unbalanced, because the opposite force is outside the system. Tada! ACCELERATION! Congrats! You've reached THE END. When a first body exerts a force F1 on a second body, the second body simultaneously exerts a force F2 = −F1 on the first body. This means that F1 and F2 are equal in magnitude and opposite in direction. O_O Sources
http://en.wikipedia.org/wiki/Newton's_laws_of_motion So. Lets use our new found knowledge of Newton's three laws to answer the question, 'Why does a brick fall faster than a feather?' Simply this, the brick has more mass. Therefore, the force needed to move it will be greater, and it will fall faster. The force needed to move the feather is much smaller, so it will fall much slower. Now back to the 3rd law.