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Science explorer
Chapter2
| Question | Answer |
|---|---|
| What is rolling friction? | When an object rolls accross a surface |
| What is friction? | the force that one surface exerts on another when the two surfaces rub against each other |
| SI | Unit of force-newton |
| Weight | the force of gravity on an object at the surface of a planet |
| inertia | the tendency of an object to resist any change in it's motion |
| freefall | a motion of a falling object when the only force acting on it's gravity |
| momentum | the product of an objects mass and veloctity |
| satallite | any objsect that orbits around another object in space |
| centripetal force | a force that couses an object to move in a circle |
| force | a push or pull exerted on an object |
| velocity | speed in a given direction |
| Static friction | friction that acs on objects that are not moving |
| sliding friction | friction that occurs when one solid surface slides over another |
| fluid fraction | friction that occurs when an object moves through fluid |
| gravity | the force that pulld objects toward each other. |
| two factors that affect the gravitational pull between objects | mass and distance |
| net force | the combination of all the forces acting on an object. |
| unbalanced forces | can caouse an object to start moving, stop moving, or cange direction |
| air resistance | the fluid friction experienced by objects falling through the air. |
| terminal velocity | greatest velocity a falling objects reaches |
| projectile | an object that is thrown |
| newtons first law of motion | an object at rest will remain at rest, and object moving at a constant velocity will continue moving at a constant velocity, unbless it is acted uopn by an unbalanced force |
| newtons second law of motion | acceleration depends on the object's mass and the net force acting on the object. |
| acceleration= | = net/force |
| newtons third law of motion | if one object exerts a force on another object, then the second objects exerts a force of an equal strength in the opposite direction on the first object |
| momentum= | = mass x velocity |
| laws of conservation | in an absence of outside forces, the total momentum of objects that interact does not change. |
| total momentum | any group of objectsremain the same, or is conserved unless outside forces act on the objects |
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lelemsis
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