The Student Room Group

I am stuck can someone please help

This is a higher physics question and i have gotten part a correct but i have done something wrong in part b? The answer to part a is 226Nimage.jpg
Original post by #engineer
This is a higher physics question and i have gotten part a correct but i have done something wrong in part b? The answer to part a is 226Nimage.jpg


Can you post what you've got so far?
Reply 2
image.jpg
Original post by Muttley79
Can you post what you've got so far?

Sorry my pen smugged
Original post by #engineer
image.jpg
Sorry my pen smugged


Try resolving the new force of 140N then you know the friction from part (a).

Then use F = ma remembering what 'F' in the formula represents.
Reply 4
image.jpg
Original post by Muttley79
Try resolving the new force of 140N then you know the friction from part (a).

Then use F = ma remembering what 'F' in the formula represents.

Which formula should I use because I used Fx=Fcos(theta)-Ff... And i got it wrong?
(edited 7 years ago)
Original post by #engineer
This is a higher physics question and i have gotten part a correct but i have done something wrong in part b? The answer to part a is 226Nimage.jpg


Resolve the new forces horizontally and subtract the friction (calculated in a)

Then use F=ma
Reply 6
Original post by ValerieKR
Resolve the new forces horizontally and subtract the friction (calculated in a)

Then use F=ma


That gets an acceleration of 1.37 but ghe answer is 0.371
Original post by #engineer
That gets an acceleration of 1.37 but ghe answer is 0.371


Then you've made a mistake somewhere
Original post by #engineer
That gets an acceleration of 1.37 but ghe answer is 0.371


(2*140cos(20degrees)-226)/100 = 0.3711393382
Check google
Is your calculator in radians instead of degrees or something?
Reply 9
Attachment not found

image.jpg
Original post by ValerieKR
Then you've made a mistake somewhere

Please help me find out what I'm doing wrong
Reply 10
Original post by ValerieKR
(2*140cos(20degrees)-226)/100 = 0.3711393382
Check google
Is your calculator in radians instead of degrees or something?

I am such an idiot sorry I was writing 126 instead of 226
Original post by #engineer
Attachment not found

image.jpg
Please help me find out what I'm doing wrong


You're subtracting 126 instead of 226

Quick Reply

Latest