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STATICS AND DYNAMICS

LOOKING AT FORCES. Peace cannot be kept by force; it can only be achieved by understanding."Albert Einstein A mind at peace, a mind centered and not focused on harming others, is stronger than any physical force in the universe." Wayne Dyer. LOOKING AT FORCES. FORCES ARE INVOLVED WHE

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STATICS AND DYNAMICS

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    1. STATICS AND DYNAMICS 4TH ESO Chemistry and Physics IES AMES

    2. LOOKING AT FORCES “Peace cannot be kept by force; it can only be achieved by understanding.” Albert Einstein   “A mind at peace, a mind centered and not focused on harming others, is stronger than any physical force in the universe.” Wayne Dyer

    3. LOOKING AT FORCES “FORCES ARE INVOLVED WHENEVER OBJECTS INTERACT” TYPES OF FORCES: GRAVITATIONAL: All objects with mass attract each other with a gravitational force. WEIGHT= m x g ELECTROMAGNETIC FORCE: They use attraction and repulsion between positive and negative charges ? Atomic structure. NUCLEAR FORCES: WEAK NUCLEAR FORCE: These are the forces involved in the radioactive decay of atoms. STRONG NUCLEAR FORCE: Positive protons in the nucleus are held together by the strong nuclear force.

    4. LOOKING AT FORCES What about simple pushing and pulling forces? All the forces involved when objects are in direct contact are electromagnetic forces? FRICTION FORCES BETWEEN SOLID SURFACES The size of the frictional force depends on: The type of surfaces in contact How hard the surfaces are pressed together The force of friction acts in the opposite direction to the motion FLUID RESISTANCE (DRAG) Drag forces depend on: The faster the relative motion is The viscosity of the fluid Drag forces try to prevent motion between objects and fluids NORMAL CONTACT FORCES This is a force that exists wherever two solid surfaces are in contact. Normal means at 90º to the surfaces. TENSION A stretched wire or a string will exert a tension force that pulls on the object it is connected to. The tension force acts along the wire.

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