Physics Edexcel Unit 1 May 2017 IAL

Original post by LittlePrince

A 1.8 kg mass is suspended from the end of a spring of original length 0.040m. The
spring extends and is now three times its original length.
The work done on the spring is
A 0.072J
B 0.11J
C 0.71J
D 1.1J
Guys why is the answer C . How could it possibly be 0.08 as Extension When It Should Be 3 Multiply By 0.04 Original length?

original length = 0.04
extended length = 3 x 0.04 = 0.12
extension = 0.12 - 0.04 = 0.08
work done = 0.5 x f x e
o.5 x ( 1.8 x 9.8 ) x 0.08 = 0.71 J.
you're welcome lol

Reply 3

LittlePrince

OP

Original post by zahraa Mohsen

original length = 0.04
extended length = 3 x 0.04 = 0.12
extension = 0.12 - 0.04 = 0.08
work done = 0.5 x f x e
o.5 x ( 1.8 x 9.8 ) x 0.08 = 0.71 J.
you're welcome lol

thanks tho it was my bad i didnt read the question properly.

Reply 4

Guys can someone please answer this question
A ball is dropped at a height from the ground and a velocity time graph for one bounce is plotted and now they're saying a "softer" ball is dropped from the same height and a velocity time graph for one bounce of this ball is plotted
what is the differnce between the velocity time graph of the first ball and the softer ball
its a 3 marks question...

Reply 5

rayyanbkc

Original post by Greetings24

Guys can someone please answer this question
A ball is dropped at a height from the ground and a velocity time graph for one bounce is plotted and now they're saying a "softer" ball is dropped from the same height and a velocity time graph for one bounce of this ball is plotted
what is the differnce between the velocity time graph of the first ball and the softer ball
its a 3 marks question...

Not sure But I think if you take air resistance into account you can mention that :
The soft ball has a lower mass meaning that it will take more time to bounce compared to the first one as a result your 2nd graph for soft ball will be more inclined (Less steeper) to the x axis which is time .

Reply 6

quraisht

5

Original post by LittlePrince

A 1.8 kg mass is suspended from the end of a spring of original length 0.040m. The
spring extends and is now three times its original length.
The work done on the spring is
A 0.072J
B 0.11J
C 0.71J
D 1.1J
Guys why is the answer C . How could it possibly be 0.08 as Extension When It Should Be 3 Multiply By 0.04 Original length?[/Q

use the formula 0.5 F*EXTENSION

Reply 7

Original post by rayyanbkc

Not sure But I think if you take air resistance into account you can mention that :
The soft ball has a lower mass meaning that it will take more time to bounce compared to the first one as a result your 2nd graph for soft ball will be more inclined (Less steeper) to the x axis which is time .

Thank you u do have a point...actually my main doubt was how a soft ball differs from a usual ball of the same size...do u have any idea about that?

How was the paper?

it was somehow confusing thoWhat did you get for the multiple choice question about the constant resultant force

Reply 10

It was somehow confusing thoWhat did u get for the multiple choice question about the constant resultant force

Reply 11

Original post by Ddde

it was somehow confusing thoWhat did you get for the multiple choice question about the constant resultant force

I don't really remember much about it...can u please remind me with the values and the question

Reply 12

Original post by Greetings24

I don't really remember much about it...can u please remind me with the values and the question

I think it was a graph question which had 4 types of graphs
Distance time, Acceleration time, Velocity time and I think velocity distance all with a straight line of proportionality and it said u have to choose which one shows a constant resultant force

Reply 13

What did you get for the Normal contact force question

Reply 14

Khushi malde

4

Original post by Ddde

I think it was a graph question which had 4 types of graphs
Distance time, Acceleration time, Velocity time and I think velocity distance all with a straight line of proportionality and it said u have to choose which one shows a constant resultant force

I picked velocity time graph

Reply 15

Original post by Khushi malde

I picked velocity time graph

Same here! and regarding the normal reaction if ur speaking of the 17th question i guess i did the force sin apha (i dont really remember the angle) equals mg and the mass was given

Reply 16

Original post by Greetings24

Same here! and regarding the normal reaction if ur speaking of the 17th question i guess i did the force sin apha (i dont really remember the angle) equals mg and the mass was given

Yes Same here

Reply 17