Need up to 30 seconds to load.
this next video is how to calculate net
force some classes did get to this when
we were back at GMS but most of you did
not so we're gonna review slash teach it
to those of you who need it the big
important things here and I would write
this down if you didn't when you were
taking notes on the Google slides
presentation if the forces are acting in
opposite directions we're going to
subtract them so we've got a force to
the right a force to the left they're
opposite again a force to the left to
force to the right they're opposite so
whether they're pushing against each
other or pulling away from each other
those are opposite forces and you're
going to subtract them if the forces are
acting in the same direction then you're
gonna add them together because they're
working together to move an object or
attempt to move an object in some
direction it doesn't matter if the two
forces are coming from the same side or
from opposite sides like one is pushing
and one is pulling either way they're
acting in the same direction so you will
add them let's remember our unit of
force capital n the Newton if we look at
our first picture we have a force to the
right and a force to the left so these
are opposites and that means we need two
opposite forces subtract them so I will
do 40 Newtons minus 40 Newtons and we
get zero Newtons so the net force is
zero which means that there's gonna be
no movement and going back to our
vocabulary these are balanced forces
okay there's no net movement no net
force the next example we also have
opposite direction forces you can see I
drew one force arrow a little bit larger
darker because it's a greater force than
the other they are in opposite
directions so we need to subtract them
so I'm going to do 60 Newtons minus 40
Newtons and our resultant force or our
net force is 20 Newtons
these forces are not balanced there are
different size different magnitudes
different strengths of forces so they
are unbalanced and direction is
important okay my greater force my force
with a higher magnitude is going to the
left so that 20 Newtons force is going
to be to the left okay make sure you
know your directions this is right side
this is left side the direction is
towards the left alright our next
example we have forces going in the same
direction and again according to your
notes which you should keep referring to
forces that are moving in the same
direction we're gonna add the forces
together alright so in our first example
we have two forces going to the right so
we have to add them 40 Newtons plus 40
Newtons and you get 80 Newtons again
these are unbalanced because they're not
acting opposite of each other in a way
that's not going to cause motion and
this is 80 Newtons to the right all
right and then the next example we have
a push force and a pull force but
they're still moving in the same
direction so we're gonna add them
together 50 Newtons plus 40 Newtons and
that will be 90 Newtons and again that's
to the right
alright and then our last example and
this one we have three different forces
so we need to break it down okay we see
some that are going to the right some
that are going to the left in this
situation I have two forces that are
both going to the right so I'm gonna
take those and I'm going to add them
together first so this force on the on
the right side pushing to the left is a
total is 100 Newtons to the right and at
this
same time I have 40 Newton's to the left
all right so now I need to subtract them
because I've got 100 Newton's going in
this direction I've got 40 Newton's
going in this direction so I'll do my
100 Newton's minus 40 Newton's and I get
a total of 60 Newtons okay my bigger
amount of force is to the right so that
is 60 Newton's to the right
