Official OCR A G481 mechanics 20th May 2013

This answer is more appropriate for seatbelts and airbags i think - crumple zones are designe to absorb some of the energy from a collision

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I don't know, I made these notes around the mark scheme as this question came up in 2010 sometime

Reply 121

OllieGCSEs

10

Original post by yodawg321

I don't know, I made these notes around the mark scheme as this question came up in 2010 sometime

A seatbelt question came up in May 2010, maybe you've confused the two - i'm not saying what you mentioned is wrong, however it's a perfect answer for an airbag or seatbelt question, so you might want to throw in 'absorbs energy' just to set it aside from the airbag/seatbelt answers :smile:

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Reply 122

rfka

How do you define the joule and watt?

Reply 123

P!=NP

Any videos for this module? Anything similar what examsolutions.net does for maths but for physics mechanics?

Reply 124

dakenSoren

2

Original post by rfka

How do you define the joule and watt?

The joule is the unit of energy and is the work done when a force of one newton moves its point of application by one metre. i.e. 1J = 1N *1m

A watt is a measure of power (work done per unit time) and so 1W = 1J/1s or in words 1 Watt is when 1 joule is expended per second.

Added stuff for Ogley

(edited 10 years ago)

C3 Revision.docx39.2KB

S1 Rev.docx339.9KB

Reply 125

zcanf

Does anyone have any model answers for car safety chapter?
Such as crumple zone, seat belts, what effects braking distance etc. ?

Reply 126

madrevision

9

Original post by OllieGCSEs

This answer is more appropriate for seatbelts and airbags i think - crumple zones are designed to absorb some of the energy from a collision

Posted from TSR Mobile

that's pretty much what the answer says.... seatbelts are mostly about keeping you in the car so that you don't hit the windshield airbags are designed to slow you down gradually :smile:

Reply 127

ChloeB43

2

Original post by yodawg321

Where does it say about series and parrallel in the spec? Can't find anything about it

http://www.ocr.org.uk/Images/81024-specification.pdf

I'm not sure. I remember seeing a few past questions on it and we always did an experiment on it in class. I think it is on the specification somewhere, where though is a mystery. Just make sure you know it..

Reply 128

zcanf

Original post by ChloeB43

I'm not sure. I remember seeing a few past questions on it and we always did an experiment on it in class. I think it is on the specification somewhere, where though is a mystery. Just make sure you know it..

Under 1.3.4 it says:

Students can carry out experiments to find the relationship between force and extension for a single spring, springs in series or parallel, rubber, polythene strip, etc.

It doesn't say we need to understand to, but it is included.