e-lesson 5.12+5.15

Best wishes,

Mr B

5.12+5.15 Starter

02 November 2011

16:15

	<<Video - simulation of gas pressure in Phun.flv>>

Questions

·         Why does the needle on the meter move when gas particles are introduced into the box?

·         What does the meter measure?

 

 

 

Answers

·         The gas particles collide with all of the walls of the container.  The wall on the right moves outwards and moves the needle.

·         Pressure.  The gas particles colliding with the walls makes a force on the walls.  The walls have a surface area so the quantity measured is pressure, p=F/A.

5.12+5.15 Questions

02 November 2011

15:55

·         5.12 recall that molecules in a gas have a random motion and that they exert a force and hence a pressure on the walls of the container

·         5.15 understand that an increase in temperature results in an increase in the speed of gas molecules

Try the animation http://www.lon-capa.org/~mmp/kap10/cd283.htm

1.    How do the particles create a pressure?

2.    If you increase the temperature, how does the movement of the particles change?

3.    If you increase the temperature, how does the number of collisions per second change?

4.    If you increase the temperature, what does this do to the pressure?