Physics Questions :) (A2 Mechanics)

[SoundEng]

Hi all

Fairly simple questions but I'm a bit rusty after the summer so wondering if anyone can help with the following two questions

1. Explain how Newton's First Law of Motion can account for the in juries sustained by rear seat passengers in a stationary car that is hit from behind by a fast moving truck.

2. The drum of a spin drier consists of a perforated cylinder which revolves at high speed. Wet clothes adhere to the inner surface of the cylinder whilst water escapes through the holes.

Explain the drying action of the spin drier in terms of one of Newton's Laws of Motion.

Is the first one to do with the passengers being accelerated due to the force from the truck crashing into the car and then not stopping until they have another force acted upon them? i.e. the headrest of the seat in front?

Second one I have no idea.

Any ideas?

Cheers

Ali

 

[MehulLakhani]

Try this

http://www.engineeringtoolbox.com/centripetal-acceleration-d_1285.html

R


Mehul

 

[Guitarman0]

By any chance do you also study OCR advancing physics for A2 because there is a really good section on page 39 in the A2 text book that would help you with the spin drier question.

It is all to do with the water no longer being accelerated towards the centre of the drum when it escapes through the holes and therefore flies off at a tangent to the rotation of the drum.

 

[SoundEng]

By any chance do you also study OCR advancing physics for A2 because there is a really good section on page 39 in the A2 text book that would help you with the spin drier question.

It is all to do with the water no longer being accelerated towards the centre of the drum when it escapes through the holes and therefore flies off at a tangent to the rotation of the drum.

I am indeed, however we have not been given text books, only notes written by the head of physics 5 years ago (he has no left.).

I thought it must have something to do with that, but we haven't done anything on circular motion or Centripetal Force