How did Physics M/J '17 52 go?

[Syed Umar]

I thought the first question was a bit tricky (to be handled with care), and the intercept produced large variations but overall, I guess it was okay.

 

[Zaina Tariq]

I thought the first question was a bit tricky (to be handled with care), and the intercept produced large variations but overall, I guess it was okay.

question 1 was alot trickier, I spent literally 10 minutes on planning what to do , but question 2 was easy.

 

[Syed Umar]

Question 1 what did you guys write?
Omg for question 2, my gradient was 0.139 but my y intercept was around 5.something but the error in the y-intercept was huge!!! For percentage errors in the end I got 11% in E and 111% in Q. Many people in my school got those answers but Idk.. the errors are quite large.

Exactly. Error in the intercept was pretty big. I got around 50% for Q. Mine was around yours for E

I wrote r as independent and f as dependent. What about you?

 

[Syed Umar]

question 1 was alot trickier, I spent literally 10 minutes on planning what to do , but question 2 was easy.

I understand. I was unsure about the IV and DV for quite a while.

Something else that was weird was they already gave an expression for K. But I guess we needed to write the one through the gradient, right?

 

[Zaina Tariq]

Question 1 what did you guys write?
Omg for question 2, my gradient was 0.139 but my y intercept was around 5.something but the error in the y-intercept was huge!!! For percentage errors in the end I got 11% in E and 111% in Q. Many people in my school got those answers but Idk.. the errors are quite large.

gradient same. E also close enough. Q wrong.

 

[Zaina Tariq]

What did you get for Q? And what was your y - intercept and uncertainty in y - intercept?
What about q1?

i guess it was 1.5%
y intercept 18.36 sth and 0.2 uncertainity.

 

[Irfanhaider0533]

i guess it was 1.5%
y intercept 18.36 sth and 0.2 uncertainity.

Hate to break it to you, but it was a false origin. You had to use equation of straight line for the y intercept

 

[Zaina Tariq]

no

What did you get for Q? And what was your y - intercept and uncertainty in y - intercept?
What about q1?

not sure about question 1, I took frequency Independent variable. and I varied it by using oscilloscope. I kept mast constant. I kept decreasing the freq which after rotation, my mass started to move more farther away from center. which tells me that r=1/f

 

[Irfanhaider0533]

no

not sure about question 1, I took frequency Independent variable. and I varied it by using oscilloscope. I kept mast constant. I kept decreasing the freq which after rotation, my mass started to move more farther away from center. which tells me that r=1/f

You cant vary frequency through the oscilloscope. You measure frequency through it. Frequency can be varied using a signal generator or through the motor itself

 

[Irfanhaider0533]

What was your y intercept and uncertainty in it? And %age uncertainty in Q?

Y intercept was 5 something and the uncertainty was also 5 :/ percentage uncertainity in q was 113 percent

 

[Zaina Tariq]

i

Y intercept was 5 something and the uncertainty was also 5 :/ percentage uncertainity in q was 113 percent

guess my y intercept is wrong. 3 marks gone. *cries*

 

[Zaina Tariq]

Yep almost got exactly same answers. I got 111% for Q uncertainty. Y intercept 5.6 or something and for worst fit y-intercept was 5.020 or something so uncertainty in y -intercept was a lot.

o man.

 

[Zaina Tariq]

My bad, y-int of worst fit was 0.0270270 and for best fit it was 5.6 something so yeah very huge absolute uncertainty.

man this is confusing, i hope I get ecf atleast. Gonna get A/B now. or in worst case C.

 

[Talha Sial]

I messed up Q2. I used x2-x1/y2-y1 to find the gradient instead of vice versa. Now my Y-intercept, value of E and value of Q and all the uncertainties are wrong because of that stupid mistake

 

[Irfanhaider0533]

Hey what did you write for q1??

Independent r
Dependent f
Mass constant
Connect motor to a dc circuit
Connect oscillocope aroubd the motor
Connect the motor to the turn table
Place mass on the table and measure r with ruler and set square
Slowly increase frequency until the mass just moves. Observe using pressure pad and motion sensor

 

[Thought blocker]

badrobot14

 

[Zaina Tariq]

I understand. I was unsure about the IV and DV for quite a while.

Something else that was weird was they already gave an expression for K. But I guess we needed to write the one through the gradient, right?

yeah you just had to tell tht about K.

 

[Zaina Tariq]

Independent r
Dependent f
Mass constant
Connect motor to a dc circuit
Connect oscillocope aroubd the motor
Connect the motor to the turn table
Place mass on the table and measure r with ruler and set square
Slowly increase frequency until the mass just moves. Observe using pressure pad and motion sensor

you my friend defo getting A*. MA SHA ALLAH.

 

[Syed Umar]

I got y-intercept around 7. Uncertainty around 3.

And yes, also smooth surface anyone? For q1.

 

[Syed Umar]

Independent r
Dependent f
Mass constant
Connect motor to a dc circuit
Connect oscillocope aroubd the motor
Connect the motor to the turn table
Place mass on the table and measure r with ruler and set square
Slowly increase frequency until the mass just moves. Observe using pressure pad and motion sensor

And measure mass with balance.