Edexcel Jan 2003 PHY1 question

Hi, could someone who has this paper please take a look at Question 5(b)...
Its about a pencil in a recessed shelf of a car and why it hits the back while accellerating, and the front whil decellerating.... anyone know why???

Reply 1

ArVi

oh, btw the above question is worth 5 marks :eek:

Reply 2

mackin boi

THe pencil is accelerating forwards...since f=ma...a force is needed...this comes from the back of the shelf pushing forwards...when at the front of the shelf the pencil is decelerating...again F=ma...it needs a force...this comes from the front of the shelf pushing backwards....this Q isnt about inertia...and a mark for clarity hehe :smile:

Reply 3

mr frag

its all down to conservation of momentum, and the fact that the pencil doesnt have breaks to stop at the same time as the car, it need a force to help it decelerate or accelerate.. as mackin boi mentioned.

Reply 4

hajira

http://homepage.ntlworld.com/keith.taggart/physics/markschemes.htm
a blessing in disguise :p:

Reply 5

nas7232

when i download the markscheme, half the answers are missing, issit me or is it meant to be like that?

Reply 6

hajira

really
i got the A2 ones..il check the AS ones

Reply 7

hajira

really
---i checked it, the phy1 Jan'03..works perfect for me!

Reply 8

nas7232

issit ok if you paste the direct download link because i downloaded "selected numerical answers" they are indeed selected answers and not the full answers.