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Unformatted text preview: Chapter 4: Newton’s Laws of Motion 4.1 Force and I nteractions Force – a push or a pull; the interaction between two bodies or between a body and its environment • Force is a vector quantity • Contact force – a force that involves direct contact between two bodies o 3 Types of Contact Forces: Normal force – a force exerted on an object by any surface with which it is contact Normal means that the force always acts perpendicular to the surface of contact, no matter what the angle of that surface F r iction force – a force exerted on an object by a surface acts parallel to the surface, in the direction that opposes sliding Tension force – the pulling force exerted by a stretched rope or cord on an object to which it's attached • Longrange force – a force that acts even when the bodies are separated by empty space (ex. The force between two magnets, force of gravity) o Weight – the gravitational force that the earth exerts on your body Supe r posi t ion of Fo rces Superposition of forces – any number of forces applied at a point on a body have the same effect as a single force equal to the vector sum of the forces • Any force can be replaced by its component vectors, acting at the same point • Net force – the vector sum (resultant) of all forces acting on a body = + R Rx2 Ry2...
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This note was uploaded on 03/26/2011 for the course PHY 210 taught by Professor Mcdemus during the Spring '11 term at Lehigh Carbon CC.
 Spring '11
 McDemus
 Physics, Force

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