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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