1. What did you learn about controlled variables by doing the three friction labs?
I larned that you can change one variable at a time to get different data.
2. In this lesson you measured sliding friction. How do you know that you actually measured sliding friction? In other words, why does the force on the spring scale measure the force of friction while pulling a block at a steady speed?
we had to measure 27 centameters before we did the lesson. The scale shows how much force it takes to pull it at a steady speed and shows how much it wants to stop.
3. Suppose you used ice as a surface type. What would you get for the friction force on ice with one block? What if you added two blocks, then three blocks on ice? What if you changed the surface area of the block on ice?
it would be easy to pull because ice is smooth and doesn't have much friction if you added more blocks or wieght it would be harder to pull because there is more friction.
4. Write a conclusion based on your results for the three different manipulated variables, surface types, weight, and surface area.
If the surface was rough it would be harder to pull and mean more friction. If the surface was smooth it would mean less friction. The smaller the surface area the less friction there is. The more weight the more friction there is.