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[Forbidden.]

1. Independant & Dependant Variables.

I don't undertsand these because I'm not familiar with responding to questions involving practicals. Could you explain using the Pendulum experiment and the current generated in the coil experiment ?


2. Lenz's law

The effect of induction is always opposite to its cause.
That's our (my Physics class) meaning of Lenz's Law, is this sufficent ?


3. Twin Paradox, does it belong to the dot point:

2.4.9 - Explain qualitatively ... the consequence of special relativity ...
OR
2.4.10 - Discuss the implications of mass dilation ... for space travel.

 

[watatank]

Independent- something you control, usually goes on an x axis.
Dependant- Something that changes depending on the change you made to the independant variable. goes on the y axis

 

[alcalder]

1. Independant & Dependant Variables.

I don't undertsand these because I'm not familiar with responding to questions involving practicals. Could you explain using the Pendulum experiment and the current generated in the coil experiment ?

Pendulum - what did you alter? The length of the string = independent variable because the change of the quantity is independent of everything else in the experiment because YOU did it.

What did you measure? Time/period = dependent variable because the change in this is completely dependent on the change you made.

Current generated in a coil - what did you alter? speed of movement of the magnet = independent

What did you measure? Current = dependent because it depends on how fast you move the magnet as to how alrge or small the current is

2. Lenz's law

The effect of induction is always opposite to its cause.
That's our (my Physics class) meaning of Lenz's Law, is this sufficent ?

"The current/magnetic field/motion induced opposes the change that caused it." That's what I use. Almost the same as yours, but not quite. So, if you are inducing a current by moving the wire down through a magnetic field, the current induced is such that it will try to induce a movement up in the magnetic field. Then you can work out the direction of induced current.

3. Twin Paradox, does it belong to the dot point:

2.4.9 - Explain qualitatively ... the consequence of special relativity ...
OR
2.4.10 - Discuss the implications of mass dilation ... for space travel.

I think you will find that it kind of fits both dot points. This is a consequence of special relativity and specifically time dilation.

 

[Forbidden.]

Pendulum - what did you alter? The length of the string = independent variable because the change of the quantity is independent of everything else in the experiment because YOU did it.

What did you measure? Time/period = dependent variable because the change in this is completely dependent on the change you made.

Current generated in a coil - what did you alter? speed of movement of the magnet = independent

What did you measure? Current = dependent because it depends on how fast you move the magnet as to how alrge or small the current is




"The current/magnetic field/motion induced opposes the change that caused it." That's what I use. Almost the same as yours, but not quite. So, if you are inducing a current by moving the wire down through a magnetic field, the current induced is such that it will try to induce a movement up in the magnetic field. Then you can work out the direction of induced current.



I think you will find that it kind of fits both dot points. This is a consequence of special relativity and specifically time dilation.

Thanks very much, it all fits now, I should now be much more confident in succeeding in my Half-Yearly for Physics.

 

[airie]

Oh, so Twin Paradox is included in the syllabus? Cos I remember the other day my teacher just told the whole year that it's not

 

[Forbidden.]

Oh, so Twin Paradox is included in the syllabus? Cos I remember the other day my teacher just told the whole year that it's not

Well I got the latest version of Excel HSC Physics and it's been reprinted from 2001 to 2006, and since it's in 2006 I'm pretty sure it could be assessed in the trials, but definitely not in the Half-Yearly I did just 2 hours ago.

The pendulum stuff was useful thanks alcader.
But never did we expect the preliminaries to return and wreak havoc with our amnesia of the preliminaries in the form of multiple choice questions.

 

[watatank]

Oh, so Twin Paradox is included in the syllabus? Cos I remember the other day my teacher just told the whole year that it's not

Twin paradox helps explain the time dialation concept..you don't need to know it, but you MAY need an example of time dialation.

Example, atomic clocks in planes travelling at super high speeds run a bit slower than normal clocks on the earth.

 

[twilight1412]

1. Independant & Dependant Variables.
2. Lenz's law

The effect of induction is always opposite to its cause.
That's our (my Physics class) meaning of Lenz's Law, is this sufficent ?

the direction of the induced current is in such a direction that it will induce a force to oppose the motion that caused it (change of flux)

usually you state it with faraday's law attached but oh well

key points are that its an INDUCED current

 

[airie]

Twin paradox helps explain the time dialation concept..you don't need to know it, but you MAY need an example of time dialation.

Example, atomic clocks in planes travelling at super high speeds run a bit slower than normal clocks on the earth.

Right. OK. The examples I usually keep in mind are the atomic clocks and muons

 

[Forbidden.]

Right. OK. The examples I usually keep in mind are the atomic clocks and muons

Excel HSC Physics.