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physics test 2
Question | Answer |
---|---|
force perpendicular to the surface that prevents an object from entering the surface | normal force |
ratio between Fsmax and Fn | coeffecient of static friction |
ratio between Fk and Fn | coeffecient of kinetic friction |
2 objects rub off each other | force of friction |
chance in position of Xf - Xi | displacement |
displacement/time | average velocity |
change in velocity of over change in time | average acceleration |
the force between two surfaces that resists the initiation of sliding | static friction |
the force that opposes the movement of two surfaces that are sliding across each other | kinetic friction |
ratio of the magnitude of the force of friction and the normal force | coefficient of friction |
the maximum force exerted on an object before it begins to accelerate | Fsmax |
change in position | displacement |
displacement over change in time | velocity |
change in velocity over change in time | acceleration |
number is given to a power of ten and all numbers given are significant | scientific notation |
the degree of exactness of a measurement | precision |
describes how close a measurement is to the accepted value | accuracy |
the digits in a measurement that are known with certainty plus the first estimated digit | significant figures |
a quantity that has magnitude but no direction | scalar ex:speed |
a quantity that has both direction and magnitude | vector ex:acceleration |
describes the interactions between an object and its environment | force |
result from physical contact between two objects | contact forces |
doesnt involve physical contact between two objects | field forces |
the amount of force that when acting on one kilogram of mass produces an acceleration of 1m/s squared | Newton |
an object at rest remains at rest and an object in motion continues in motion with constant velocity | Newton's first Law |
the tendency of an object not to accelerate | inertia |
the vector sum of all forces acting on an object | Net Force |
a single force that acts on an object as a result of the interaction of object and its environment | external force |
objects that are at rest or moving with constant velocity | equilibrium |
part of a vector that is parallel to the x axis | x component |
part of a vector that is parallel to the y axis | y component |
the velocity of an object at a specific instant or point in the objects path | instantaneous velocity |