Next Physics e-lesson 5.12+5.15

Dear 11.1X,

Welcome to another e-lesson! 

Hope you’re all safe and dry and have internet – time to turn off Skype and Facebook and get started! 

This e-lesson consists of 3 objectives; 5.12, 5.15 and 5.11.  I’ll e-mail the other objective separately.

Instructions for Objective 5.12 and 5.15

1.    

5.12+5.15 Starter.  Watch the video and think about the question.  No need to type anything.

2.    5.12+5.15 Questions.  Open the animation.  Forward this e-mail to your blog and complete the questions.

3.    5.12+5.15 Plenary.  Open the attached ppt.  View as slide show.  Think about what the blanks in the table are.  Check your answers with slide 2.  No need to type anything.

4.    Answers to step 2 will be sent separately.  Don’t look at them until you’ve done the work!

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?

They collide, and therefore increase kinetic energy

2.    

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

It increases as heat causes the particles to vibrate more rapidly

3.    

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

The number of collisions per second increases 

4.    

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

The pressure then increases 

5.12+5.15 Plenary

02 November 2011

15:55

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

Ideal gases - summary of terms.pptx Download this file