Contact vs. Non-Contact

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Presentation transcript:

Contact vs. Non-Contact Forces Contact vs. Non-Contact

Contact vs. Non-Contact Forces Forces are responsible for all the intereactions between particles and objects. Forces can be divided in 2 categories: contact; and non-contact. Contact forces are forces that act between two objects that are physically touching each other. Non-contact are forces that act between two objects that are not physically touching each other.

Forces Contact Non-contact Reaction; Tension; Friction; Air resistance. Magnetic; Electrostatic; Gravitational

For every action, there is na equal and opposite reaction Contact Force When a contact force acts between two objects, both objects experience the same size force, but in opposite directions Newton’s Third Law of Motion: For every action, there is na equal and opposite reaction

Contact: Reaction Force An object at rest on a surface experiences a reaction force. Is a force acting in the opposite direction.

Contact: Tension Force An object that is being stretched experiences a tension force. Is the force that is transmitted through a string, rope, cable or wire when it is pulled by forces acting from opposite ends.

Contact: Friction Force Two objects sliding past each other experience friction forces; Friction: the resistance that one surface or object encounters when moving over another. Depends on the materials

Contact: Air resistance Force An object moving through the air experiences air resistance. Is the frictional force air exerts against a moving object. The faster the object’s motion, the greater the air resistance

Non-contact: Magnetic Force A magnetic force is experience by any magnetic material in a magnetic field; Magnetic field: área surrounding a magnet that can exert a force on magnetic materials. Opposite poles atract each other. Same poles repel each other

Non-contact: Electrostatic Forces Is a force experienced by any charged particle in na electric field

Non-contact: Gravitational Force Is a force experienced by any mass in a gravitational field. Masses are attracted towards each other by gravitational force