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# newton's laws

QuestionAnswer
1st law law of inertia
inertia tendency of an object NOT to accelerate
when the external force is zero... it's acceleration i s zero
objects in motion or rest will stay in motion or at rest UNLESS... acted on by an external force
mass is a measure of inertia
inertia is a measure of mass
inertia is NOT... a measure of weight
weight... is a measure of local gravity on mass
net external forces are... vector sum of all forces acting on an object
the net external forces are...` F(friction), F(gravity), F(normal), F(applied)
equilibrium... condition in which net external forces equal zero
2nd law law of impulse
impulse is... a force acting over a time
law of impulse is most often used for... collisions and impacts
the acceleration of an object us directly proportional to... the net force acting on the object and inversely proportional to the objects mass
F= ma
3rd law law of interaction
interaction is... when two or more objects act on one another
forces often exist in... pairs
net external force F(gravity)= weight, F(normal)=rxn to weight, F (application)=outside force, F(friction)= rxn to outside force
forces tend... to work in pairs
forces of friction dry, fluid, lubricated, skin, internal
dry friction static and kinetic
static friction resists against movement
kinetic friction resists while moving
fluid friction mostly related to chemicals
lubricated friction mostly related to engines
skin friction introduces drag and affects airplanes and swimmers
Created by: accident_prone

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