Pysics Paper 31 (Discussion only)

[unplugged]

:/
You know, for the first question. Where did your line start? like, at 0? mine began at 1.2 N on the y axis.

yea same.

 

[Ahmooosh]

:/
You know, for the first question. Where did your line start? like, at 0? mine began at 1.2 N on the y axis.

i think same here

haha stupid question , but what would happen if u push the trolley with less force than ur answer ?

 

[unplugged]

Nothing , static friction was preventing it's movement.

 

[Rangers]

What was happening to acceleration before 4 N?

 

[unplugged]

Was that a question . Do you mean what was happening to the acceleration before 1.2?

 

[Rangers]

Was that a question . Do you mean what was happening to the acceleration before 1.2?

Yea what ever

i said the speed was Constant

so no acceleration

 

[unplugged]

Well , erm. No acceleration is true , but since we're considering a trolley that was never moving. Then it wouldn't be moving if there was never any acceleration to start with.
And i mean , the case is rather obvious. There was static friction preventing the trolley from moving. So initial force was needed to break that and then normal friction would be less , which allows movement and acceleration.

 

[Rangers]

Well , erm. No acceleration is true , but since we're considering a trolley that was never moving. Then it wouldn't be moving if there was never any acceleration to start with.
And i mean , the case is rather obvious. There was static friction preventing the trolley from moving. So initial force was needed to break that and then normal friction would be less , which allows movement and acceleration.

SOOOOO
WHAT IS THE EXACT ANSWER, of course u didnt wrote this answer?

 

[WayneRooney10]

What did you guys get for the resistance across the variable resistor?

 

[unplugged]

I just wrote no movement ;>. It would be like you trying to push a building. Nothing happens.

 

[unplugged]

What did you guys get for the resistance across the variable resistor?

1.9 ohm i think

 

[WayneRooney10]

how did you make that circuit? with the switches?

 

[unplugged]

did you get the same? , resistance that is

 

[unplugged]

Two parallel lamp , with one lamp having it's own switch and then one switch for the whole circuit.

 

[Rangers]

I just wrote no movement ;>. It would be like you trying to push a building. Nothing happens.

So my answer is wrong?

 

[WayneRooney10]

I got 2.88 ohms.

 

[unplugged]

I got 2.88 ohms.

How did you arrive at that. I just took the value of resistance that would have provided the same current as we got in the first question.

 

[WayneRooney10]

Two parallel lamp , with one lamp having it's own switch and then one switch for the whole circuit.

Yeap! I did the same

 

[WayneRooney10]

I got 2.88 ohms.

How did you arrive at that. I just took the value of resistance that would have provided the same current as we got in the first question.

I got 1.25A for the current. Divided 3.6V/1.25A = 2.88 ohms

 

[unplugged]

Well , i think he gave us the power then said what would the current be if the optimal P.D. was present. Optimal P.D> was 3.6 i think yea. and i think the current was like 2.5 , but it's kinda of foggy.