Newton's Second Law

acceleration (cause)

NET FORCE

Net Force cause a change in state of motion

Newton's Second Law

Force and Acceleration

direct relationship

one one increases, the other increases

when one decreases, the other decreases

inverse relationship

when one increases, the other DECREASES

Newton's Second Law

a net force acting on an object produces an acceleration that is directly proportional to the net force and inversely proportional to the mass

∑F=ma

equation to express the relationship between net force, acceleration and mass

mass-acceleration

mass is always inversely proportional to acceleration

net force-acceleration

net force is always directly proportional to acceleration

net force-mass

net force is always directly proportional to mass

Net Force

the vector sum of all forces acting on an object

constant velocity

if at ____, the NET FORCE and ACCELERATION will both be ZERO

friction

resistive force--acts against motion

caused by the interaction of surface irregularities

types of friction

static

kinetic

fluid

static friction

acts on stationary objects, preventing them from moving

usually greater than kinetic friction

kinetic friction

friction that acts on sliding objects

coefficient of friction

unitless, depends on both of the surfaces

f=µn

f=friction

µ=coefficient of friction

n=normal force

fluid friction

caused by a fluid on an object moving through it

creates DRAG

resistive force

acts opposite the direction of motion

ex. friction, air resistance

speed-air resistance

direct relationship.

As speed increases, so does air resistance

terminal velocity

when a falling object whose air resistance is enough to cancel out it's velocity, putting it in dynamic equilibrium

causes of air resistance

influenced by velocity, shape, and surface area

shape and surface area

something flat will have more air resistance than something round, because there is more for the air to push up on