Coach Francis Chapter 10 CPA
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33 terms
Terms | Definitions |
|---|---|
 force | push or pull |
| newton | the strength of a force is measured in the SI unit |
| net force | the combination of all forces acting on an object |
| unbalanced forces | can cause an object to start moving, stop moving, or changing direction |
| balanced forces | equal forces acting on one object in opposite directions |
| balanced forces... | acting on an object do not change the object's motion |
| unbalanced forces... | acting on an object result in a net force and cause a change in the object's motion |
| friction | the force that two surfaces exert on each other when they rub against each other |
| the strength of the force of friction depends on 2 factors: | (1) How hard the surfaces push together and (2) The types of surfaces involved |
| static friction | the friction that acts on objects that are not moving |
| sliding friction | occurs when two solid surfaces slide over each other |
| rolling friction | when an object rolls across a surface |
| fluid friction | occurs when a solid object moves through a fluid |
| gravity | a force that pulls objects toward each other |
| law of universal gravitation | states that the force of gravity acts between all objects in the universe |
| two factors affect the gravitational attraction between objects: | mass and distance |
| mass | a measure of the amount of matter in an object |
| SI unit for mass | the kilogram |
| weight | the force of gravity on a person or object at the surface of a planet |
| free fall | when the only force acting on an object is gravity |
| air resistance | The fluid friction experienced by objects falling through the air |
| terminal velocity | the greatest velocity a falling object reaches |
| projectile | an object that is thrown |
| Newton's first law of motion | states that an object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force |
| inertia | the tendency of an object to resist a change in motion |
| Newton's second law of motion | states that acceleration depends on the objects mass and on the net force acting on the object |
| Newton's third law of motion | states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object |
| momentum | a characteristic of a moving object that is related to the mass and the velocity of the object |
| momentum= | mass*velocity |
| law of conservation of momentum | states that in the absence of outside forces, the total momentum of objects remains the same, or is conserved, unless outside forces act on the objects |
| satellite | any object that orbits another object in space |
| centripetal force (center seeking) | any force that causes an object to move in a circular path |
| Satellites in orbit around the Earth continuously | fall toward the Earth, but because Earth is curved they travel around it |
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