Tuesday, March 20, 2012

Forces 101

When talking about Force you can also refer to Newton's second law of motion which states that if a net force acts on an object, then the object accelerates proportional to the net force and inversely proportional to the mass of the object being accelerated. Terms were given within the chapter such as Mass which is a measure of the inertia of an object. The Normal Force is the perpindicular force of a surface pushing back on an object when the object pushes against the surface. Friction is a force on an object when the object slides or tries to slide on a surface or through a medium such as air or water. Centripetal Force is a force pulling an object toward the center of a circular path as it travels around a circle. Gravity is the force that causes objectsto fall to the ground. The Acceleration Due To Gravity (g) is a constant acceleration at which any object of any weight falls to the ground when no other force except gravity is acting on it. Weight is the force of gravity on an object.

Newton's second law of motion (F=ma); Force= Mass x Acceleration

For this equation, when mass is measured in kilograms (kg) and acceleration is measured in m/s (squared), then net force (F) is calculated in newtons (N). using this equation, you should be able to see that the acceleration is always in the direction of the net force. There are other forces that can act upon an object. the Normal force is the perpendicular force of a surface, such as the ground, pushing back on an object pushes against the surface. A ball falling from the top of a building is also an example of a force that acts on an object causing it to accelerate.

The value for the acceleration due to gravity is g=9.8m/s (squared) 

  

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