Projects: UDL : Friction Scaffolding
This page last changed on Aug 02, 2007 by azucker.
Friction Grade 3-4
Exploring the Question
Slip sliding away
Friction Grade 5-6
IntroductionExploring the Question
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.
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)
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?
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? ______
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