5.12+5.15 Starter 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
· 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 create a pressure by colliding with the wallsof the container
2. If you increase the temperature, how does the movement of the particles change? The average kinetic energy (the average speed) of the particles will increase.
3. If you increase the temperature, how does the number of collisions per second change? If you increase the temperature, the number of collisions per second increases.
4. If you increase the temperature, what does this do to the pressure? If the temperature increases, the pressure increases. 5.12+5.15 Plenary 
· 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
· 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 create a pressure by colliding with the wallsof the container
2. If you increase the temperature, how does the movement of the particles change? The average kinetic energy (the average speed) of the particles will increase.
3. If you increase the temperature, how does the number of collisions per second change? If you increase the temperature, the number of collisions per second increases.
4. If you increase the temperature, what does this do to the pressure? If the temperature increases, the pressure increases. 5.12+5.15 Plenary
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