unit 2 Flashcards
an object in equilibrium
-remains at rest
-movies in a straight line at a constant speed
-forces are unbalanced
mass
the amount of matter in an object (kg), it always stays the same
weight
measurement of the pull of an object by a gravitational field (in Newtons), in depends on where you are
Fg=mg
inertia
resistance to acceleration
(more mass = more inertia)
how to linearie data
-determine relationship (equation between variables)
-arrange equations to determine what to graph
-what is significance and how can it be used to determine the unknown
contact forces
interaction between objects in contact with each other
distance/field forces
interactions between two objects that are NOT touching
direction of spring force is always in the ____ direction of the displacement
opposite
Hooke’s Law
Fs=-kx
(spring force = spring constant time the displacement)
spring constant
stretchiness of the spring
the greater the spring constant the stiffer the spring
static friction
rolling or non moving friction
Ff= mew * Fn
kinetic friction
sliding friction between two objects
Newtons 3rd Law
for every action there is an equal and opposite reaction (force pairs)
newtons 1st law
if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
newtons 2nd law
F=ma
forces in a force pair:
-equal in magnitude
-the same type of force
-in opposite directions
-act on different objects
key ideas of N2L
-net force indicates the direction of acceleration
-negative acceleration —> greater downward force
-positive acceleration—> greater upward force
atwood machine
-the acceleration is the same (different directions)
-if the pulley is massless then the tension is the same on both sides
