1st law
according to newtons first law, a ball at rest will _____ _____ _____ until acted upon
stay at rest
what is the unit for force
newtons (N)
if a 5000 kg mass is moving at a speed of 43 m/s, what is its velocity?
215,000 kg/m/s
how do we calculate weight
mass times gravity
what is the equation for force
f = ma
inertia depends on an objects ______
calculate the force of a chargin 5,220 kg elephant moving at 3.2 m/s.
16,704 N
what is the equation for momentum and what are the units
p = mv
kg/m/s
what is the number for acceleration due to gravity
9.8 m/s2
what is the formula for acceleration
a = f/m
the first law is also known as the law of
inertia
a truck requires 3,100 N of force to be able to come to a stop as it decelerates at 23 m/s2, what is the mass of the truck
134.8 kg
what is the term used to describe a moving object and how much force is needed to change the objects speed
momentum
if two cars collide and stick together, what type of reaction is this
inelastiv
what is the equation for mass
m = f/a
newtons first law means that the forces acting on an object are
balanced
an object with more _____ will have less _____
mass, acceleration
newtons third law means that the forces are
unbalanced
if two people run into each other and bounce off one another, what type of reaction is this
elastic
what is the equation for gravity
F = Gm1m2/d2
what does newtons first law state
an object at rest will stay at rest or an object in motion will stay in motion unless acted on by another force
newtons second law describes how ___, ____, and ____ are related
force, mass, acceleration
action-reaction
what equation would be used to calculate the speed of 2 cars after they crash & stick together. The mass of the first is 1,020kg and moving at 20 m/s and the second had a mass of 890kg and was moving at -22 m/s.
m1v1 + m2v2 = m(total)v
what is the equation for the conservation of momentum
m1v1 + m2v2 = m1v1 + m2v2