Physics Unit 2 - Dynamics Flashcards
rolling friction
occurs when a round object rolls across a surface
kinetic friction
sliding friction
normal force
exerted by one object on another perpendicular to their common surface of contact
static friction
force parallel to two surfaces; occurs when they are not sliding
Newton’s 1st Law of Motion
(law of inertia)- if the net force on an object = 0, the object at rest remains at rest; an object in motion remains in motion in a straight line w/ constant velocity
Newton’s 2nd Law of Motion
the acceleration of an object is directly proportional to the net force acting on it, and inversely proportional to its mass:
net force = mass*acceleration
Newton’s 3rd Law of Motion
Whenever an object exerts a force on a second object, the second object always exerts a force on the first object which is equal in magnitude but opposite in direction
formula for coefficient of friction
mu = force of friction/normal force (μ = Ff/FN)
formula for force of friction
coefficient of friction times normal force (Ff = μFN)
what is mass?
the measure of inertia on an object
what are the two components of gravity?
perpendicular force and parallel force
inertia
tendency of objects to maintain their state of motion
acceleration is directly proportional to
net force (2nd law)
acceleration is inversely proportional to
mass (2nd law)
equilibrium
when a=0 (a of 1st law)
