User:Dr.sheldon/sandbox

physics,this is not an ordinary science or math.physics is diffrent.and i will show you over this next overview.

Physics 3 laws and main puposes Physics has 3 laws.first,Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. Second,The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector. Finnaly,For every action there is an equal and opposite reaction.An example for Newtons first law is,think of it like this,This we recognize as essentially Galileo's concept of inertia, and this is often termed simply the "Law of Inertia".An example for the 2nd law, This is the most powerful of Newton's three Laws, because it allows quantitative calculations of dynamics: how do velocities change when forces are applied. Notice the fundamental difference between Newton's 2nd Law and the dynamics of Aristotle: according to Newton, a force causes only a change in velocity (an acceleration); it does not maintain the velocity as Aristotle held.

This is sometimes summarized by saying that under Newton, F = ma, but under Aristotle F = mv, where v is the velocity. Thus, according to Aristotle there is only a velocity if there is a force, but according to Newton an object with a certain velocity maintains that velocity unless a force acts on it to cause an acceleration (that is, a change in the velocity). As we have noted earlier in conjunction with the discussion of Galileo, Aristotle's view seems to be more in accord with common sense, but that is because of a failure to appreciate the role played by frictional forces. Once account is taken of all forces acting in a given situation it is the dynamics of Galileo and Newton, not of Aristotle, that are found to be in accord with the observations.An discription for newtons 3rd law is This law is exemplified by what happens if we step off a boat onto the bank of a lake: as we move in the direction of the shore, the boat tends to move in the opposite direction (leaving us facedown in the water, if we aren't careful!).These are the 3 laws of physics.

Now that we know the 3 laws we must move to 'work'.Work is not when you get up at 6AM its one of the most impotant things in physics.The concepts of work and energy are closely tied to the concept of force because an applied force can do work on an object and cause a change in energy. Energy is defined as the ability to do work.Simply,this means if i move a 3 pound brick 1 mile this is the same amout of work as moving a brick that is 6 pounds a mile the same amout of work,eve thoe this may make me swet or drarey more.This is work.

Potentiel Energy.This is like Work gust usually with objects,in this,this is where the comman E=MC2 plays.An object can store energy as the result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly, a drawn bow is able to store energy as the result of its position. When assuming its usual position (i.e., when not drawn), there is no energy stored in the bow. Yet when its position is altered from its usual equilibrium position, the bow is able to store energy by virtue of its position. This stored energy of position is referred to as potential energy.

Now that you have the ground rules for physics take this and go strive for more.

ΆΏώשת±≠≪≫DR.SHELDON COOPER

newtons 3 laws of motion cliffs nots.com the physics classroom.com