National 5 Physics 2015-2016

Meet you in princes street tomorrow, I'll meet jeff at Union Square and we will get a train to Edinburgh

Nah Yusuf's gonna pussy out. Just bring yourself

Who the f is Yusuf?

Of course he's going to bring himself. He's not bringing a random "Yusuf" too!!

Nah Yusuf's gonna pussy out. Just bring yourself

Don't even ask. I don't even know.

YAS, His name is Yusuf

Whose? You're confusing me now :/ The pair of you!

We should talk about Physics cos the exam is in like 75 hours :/

Didn't you get banned before?

Plenty of time, just remember your circuits and formulas

Its Higher Physics that you should be worried about, its a beast.

Plenty of time, just remember your circuits and formulas

Its Higher Physics that you should be worried about, its a beast.

Are semiconductor diodes in the course ?

No. I asked that already before and apparantly its a part of higher not Nat 5. Its in my how to pass book which is why i asked. publishers should be more careful when producing these books

Thanks

Do you know when you are supposed to use

Ek= Ep ?

Yes so you would use that in the "Conservation of Energy". Let me give you an example so you can understand it because it is quite tricky.

Example:

A 3.0kg ball is dropped from a height of 2.0m
a) Calculate its potential energy
b) Calculate its speed just as it hits the ground.

a) You would simply do Ep=mgh i.e 3.0 x 9.8 x 2.0
= 58.8j
= 59j
b) Well to calculate the speed you would need the kinetic energy right? But you aren't given it so you are to assume the potential energy has been converted to kinetic energy. Also you can use your common sense because when a ball is dropped it's moving and kinetic energy is the energy in a moving object.

So: Ek = 0.5mv^2
v^2 = 59/(0.5 x 3.0)
v^2 = 39.3
v = 6.3ms-1

However you can also do this question algebraically. This is where Ep=Ek comes in.

Ep=Ek (because potential energy is converted to kinetic energy)
mgh=0.5mv^2
gh=0.5v^2
2gh=v^2
v = squareroot of 2 x 9.8 x 2.0
= squareroot of 39
= 6.3ms-1

I remember when you were trying to help me with that Gravitational Potential Energy Question from a pastpaper relating to the ball dropping etc...
You used the algebraic method to find the answer and it was right but you deleted it

So I think you know what you're doing

Wowww thankss Yeah Method 2 is the way I got taught, just forgot how to do it really. I see that you took away the m from both sides, what if it gives you the mass would you substitute the number ?

Thank you so much !!!

In this question you are given the mass which is 3.0. However you are trying to get v on it's own and when m goes to the other side it'll just become m divided by m i.e 3/3 which cancels it out. Make sense?

I think it makes sense, just need to do some questions on it

THANKS SO MUCH sameehaiqbal