Which is moving horizontally in that direction okay so a let's actually say these are two cars and the other one is towing a one car and there's that a you know cable which which which makes attention there okay so ladies and gentlemen what i'm trying to say is these cars are moving in that direction or eastwards right so a that means the force as a result of the tension or any force in that direction its angle is zero degrees okay why because it's in the same direction in which the force is being applied okay so that means for supplied in that direction then it's cos of zero so anything opposing the applied force it's obviously acting in that opposite direction.
That means you've got a straight line like that a and you've
got two forces that's obviously if you draw a free body diagram so that force
is a result of a tension or applied force the angle is called zero now that
you've got the opposite force in the opposite direction then it forms that
angle of 180 degrees so that means a fossil fraction will be cos of 180 degrees
okay so ladies and gentlemen i'm not really sure if that helped but i hope to
some of you guys it helped because in case if your teacher is trying to teach
you a you know how to answer these questions and teaching you in terms of the
angles you will be able to fully understand what they mean okay so obviously
that means there we've got cos of zero degrees okay then you add what is m
they've just told us the m it's a 80kg obviously we know this is nine point
eight a this is the acceleration and the gravitational acceleration of course
and a the distance is 20 meters okay.
And cos of 180 degrees very very much important ladies and
gentlemen plus work as a result of friction and this is equated to zero okay so
ladies and gentlemen this is exactly what we are calculating okay very very
much important guys so now you can just punch all of these and pa and edit to
all of this okay but let's do it in part in paths such that we punch this and
then we punch that so that means you've got 960 multiplied by 20 multiplied by
cos of angle 0 then we get 19 a thousand two hundred and it's a positive value
okay then let's punch all of this ladies and gentlemen.
Before i forget very very much important that at all times
your calculator is in degrees okay if it's in what is it is it red or red or
whatever as long as it's not in decrease you might be getting some incorrect
values especially when you're going to write a geography paper 2 which is map
work a mathematics paper 2 in particular and again also in in in paper one
where you might need to calculate some angles when necessary you will need your
calculator to be in decrease and again in physical sciences always make sure
that your calculator is in a degrees then let's punch all of this it's 80.
I'm sure some of you are done already into 9.8 into 20 then
cos of 180 degrees then i'm getting a negative value which is negative 15 680
obviously this is added to work as a result of friction and it's equated to
zero so ladies and gentlemen what i wanted you to notice what i actually wanted
to what i wanted you to notice is that negative sign over there okay so guys
some of us we might not use a you know this course that course as part of our
formula that costs over there that course over there we might not use it as
part of our formula why because we know a that cause actually a you know have
impact on the direction in which the force is acting on an object.
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