chapter 2-3
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Created by:
zombieman1 on April 6, 2011
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30 terms
Terms | Definitions |
|---|---|
 force | A push or pull. |
| newton | The strength of a force is measured in the SI unit. |
| netforce | the combination of all forces acting on an object. |
| unbalanced forces | A net force acting on an object can make it unbalanced. |
| balanced forces | equal forces acting on an object in opposite directions. |
| friction | the force that two surfaces exert each other when they rub together. |
| static friction | friction that acts on objects that are not moving. |
| sliding friction | friction that occurs when one solid surface slides over another. |
| rolling friction | friction that occurs when an object rolls over a surface. |
| fluid friction | friction that occurs as an object moves through a fluid. |
| gravity | the force of attraction between all masses in the universe. |
| mass | A measure of the amount of matter in an object. |
| weight | the force of gravity on a person or object at the surface of the planet. |
| free fall | the motion of a falling object when the only force acting on it is gravity. |
| air resistance | objects falling through air experiance a type of fluid friction. |
| terminal velocity | the force of air resistence equals the weight of the object. |
| projectile | an object that is thrown |
| inertia | the tendency of an object to resist any change in its motion |
| momentum | a moving object that is to the mass and the velocity of the object. |
| Law of conservation of momentum | The rule that in the absence of outside forces the total momentum of objects that interact does not change. |
| satellite | any celestial body orbiting around a planet or star |
| centripetal force | any force that causes an object to move in a circular path. |
| pressure | the force exerted on a surface divided by thue total area which the force is exerted. |
| pascal | a unit of pressure equal to one newton per square meter. |
| fluid | A material that can easily flow. |
| barometer | an instrument that measures atmospheric pressure. |
| buoyant force | upward force exerted on an object immersed in a fluid. |
| Archimedes principle | the buoyant force on an object is equal to the weight of the fluid displaced by the object. |
| density | the amount per unit size. |
| pascals principle | When force is applied to fonfined fliud, the change in pressure is transmitted equally to all parts of the fluid. |
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