Force and acceleration

Páginas: 2 (374 palabras) Publicado: 20 de marzo de 2012
Force and Acceleration:
Force is any influence that causes an object to undergo a change in speed, a change in direction, or a change in shape. Is that which can cause an object with mass to changeits velocity to accelerate, or which can cause a flexible object to deform.
Newton: Born December 25, 1642 and died March 20, 1727. He was an English physicist who is considered by many to be thegreatest and most influential scientist who ever lived.
• 1st Law: Every object will remain at rest or in uniform motion in a straight line unless it is made to change its state by the action of anexternal force.
• 2nd Law: The resultant force acting on a body results in an acceleration which is the same direction as the resultant force and is directly proportional to the magnitude of thisforce and inversely proportional to the mass of the object.
• 3rd Law: For every force or action there is an equal but opposite force or reaction.
Acceleration: is the rate of change of velocitywith time. In one dimension, acceleration is the rate at which something speeds up or slows down. Is measured in meters per second squared (m/s2).
• Uniform or constant acceleration: is a type ofmotion in which the velocity of an object changes by an equal amount in every equal time period. Example : An object in free fall in a uniform gravitational field. The acceleration of a falling body inthe absence of resistances to motion is dependent only on the gravitational field strength.
• The acceleration due to gravity is a natural unit of acceleration. Is sometimes called the "g force" eventhough it is not a measure of force.
Newton`s Second Law:
 This law explains what happens if on a moving body, it acts a net force; the force will change the state of motion, changing speed ordirection in module. The force is simply defined as a function of time when applied to an object.
 The importance of this equation lies primarily in resolving the problem of dynamics to determine...
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