Next Physics e-lesson 5.12+5.15

 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?

The particles is moving quickly and colliding to the surface of the wall

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

The particles vibrate fasters

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

Number of collisions increase

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

Increase the Pressure

 

 

5.12+5.15 Plenary

02 November 2011

15:55

<<Ideal gases - summary of terms.pptx>>

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