Friction Grade 3-4

Exploring the Question
Describe what it feels like to walk around on ice 

Slip sliding away
Procedure, item 4 (drawing)
L2: Include a "stamp" next to the drawing of slide showing a thought balloon "connected" to the slide that includes the words "The slide is made of "
L1: Include the above with the words "The slide is made of shiny metal"
Procedure (continued), items 6 and 7
I interpreted the question differently, to mean why is such-and-such material especially "sticky" (or slippery, item 7)? These are tough questions! However, if the answers we want are about the height of the slide, perhaps we should rewrite the questions to read: "The reason I think this surface is the most sticky - my evidence - is ____ " and
"The reason I think this surface is the most slippery - my evidence - is ____ "

Playground Surfaces
Slide Model
Should the procedure for using the slide model precede the model? Or perhaps to the right of the model would be text, "Procedures for using the model are shown below"
Questions, item 5
There is a typo. As part of L1, the text box should read "Just like in the real world, slippery objects ... slide easily with very little effort" (not "without very little effort")

Friction Grade 5-6

IntroductionExploring the Question
Name two surfaces (besides ice) that are very, very slippery:

List the features that you think make a surfaceslippery. You can use a drawing to help show the features

Name two surfaces that have a lot of friction

List the features that you think make a surfacehave friction. You can use a drawing to help show the features.

Penny Heat 

Exploring heat

1.  Rub your hands together, first slowly and then quickly. You probably noticed that your skin warms up when you rub your hands quickly.

2.  Why to you think this happens?

3.  Rub a penny on a hard surface, like a block of wood. Don't use a surfacethat could be damaged. Rub it in a circle ten times. Then test the temperature of the penny by holding it against the top of your hand.

4.  You probably noticed that the penny heats up. Why do you think it does?

5.  Is it your finger that makes it hot, or the rubbing?    o finger    o rubbing

6.  How can you tell?

7.  Which of these things would make the penny heat up more? (3 choices)
Experiment

5.  Start the sensor.  Note the temperature of the penny before you start touching, rubbing, or pushing the penny.  Temperature: ______

7.  Describe the graph.  Which had more heating effect, rubbing slowly or rubbing fast?
Procedure (continued)

3.  Describe the graph.  Which had more heating effect, pushing down lightly or pushing down hard?

7.  Describe the graph.  Which caused more heating, rubbing on the wood or rubbing on the waxed paper?  (2 choices)  Why do you think this was true?  ______