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Forces and Friction By: Michelle Aukerman Third Grade LA State GLE 24 and 26 Day 1: Before We Start….. What is force? Force is the push or pull of an object. This may include gravity, moving an item, or the ground against an object. What is friction? Friction is the sliding of one object at a certain force against another. Ex: Bike tires and the road Hmm…Let’s look at it a little closer! • Look at the following clips. • Think about the examples of force and friction. • What gets things Moving/Stop • A World without Friction • Friction Free Tug of War • Acceleration and Force • Creating Friction between Bus and Book Your First Task • In groups of 3 you will use a digital camera to find examples of friction and force in your environment. • Your group will print out 3 of the pictures you took and combine them in order to make a class quilt of Force and Friction. Day 2 Task 1: More About Forces and Friction Yesterday, we discovered what force and friction is. After we read Can You Feel the Force? (p.22-25), you will be asked to type in what you know about force and friction from yesterday’s activity and what we have just read…Good Luck! Force: Friction: Day 2: Quick thoughts on Forces and Friction • If a larger weight is added to an object (ex: a truck) it will need a greater force to give it energy to move. • Energy can be applied to an object by a push or pull. Other types of energy that can be applied is twist or turns. • Do you think that you would need more energy to make an object go faster? What about less energy. Do you think it would make an object go slower if it is the same object? • How much energy do you think an object has if it is stopped or is sitting at rest? Day 2 Task 2: Playing around with the energy that is behind force, pushing and pulling • Click here to access the Force and Weight Truck Game • Click here to play the Pushes and Pulls game and take the quiz • What have you learned by playing these games? • What happened when we added more weight to the same truck? • What happened when we pushed or pulled the toy horse with different forces? Day 3 Task 1: A little background on your next task • In your groups of 3 we will be looking even closer at forces and friction in a hands-on-activity. • We will be using a ramp made by our text books and a toy car to test force and how it’s related to friction. We will change the surfaces that will be placed on the books in order to decide if the friction between the car and ramp change. • First, we will observe our surfaces by taking pictures using our digital microscope. Observe the coarseness, smoothness, or other characteristics of the materials that you think may change the force needed on the car in order to get it to the top of the ramp. • Second, We will upload the digital pictures for everyone to discuss what we noticed about the materials. Day 3 task 1: Exporting the pictures from the digital microscope? Exporting Pictures using the Digital Blue 1. Choose the picture you want to export. 2. Click on the Export button Click Here to Export 3. This will bring up a browse area to save the picture. 4. Save the picture in S drive. Day 3 task 1: Exporting the pictures from the digital microscope? Click Here to Export 3. This will bring up a browse area to save the picture. 4. Save the picture in S drive. Save on the S Drive Day 3 Task 1: Insert your microscope pictures Day 4 Task 1: Begin Lab Report • Review your digital microscope pictures and observation from yesterday. • With your group decide the materials you will be using from what your teacher has brought. • Complete your materials, hypothesis, and experiment steps section. Force and Friction Lab You will observe the relationship between forces in friction by observing a cars friction on different surfaces. You will build a ramp made of test books. Then, you will place a surface on top of the books such as: sand paper, saran wrap, cloth, paper towel, etc. Next, using the same amount of force you will try to push the car up the ramp. Also observe different strengths of pushing forces behind the car and notice the difference. (HINT: Much like the toy pony game) Your Report • Materials: • Hypothesis: • Experiment: • Observed: • Was your hypothesis correct? Why or Why not? Continued • Go through the steps of the experiment. • Using the same and then different amounts of force, push your cars up the ramp. Do you note any difference?
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