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Https phet colorado edu en simulation legacy projectile motion

24/04/2021 Client: muhammad11 Deadline: 2 Day

Title: Forces, Friction and Motion (due 6.8.17) Introduction Today we will learn about how the force put on an object determines how it will move when there is no friction and when there is friction. 1. Click this link: http://phet.colorado.edu/en/simulation/forces-and-motion-basics This is a screen shot of the website: 2. Click the button that says “Run Now”. It might take a few minutes to load. The screen will look like this: 3. All answers will be recorded on this document. You will have to switch between the document and the forces and motion simulation in order to complete all parts of the activity. Explore 1. Place a man on each side of the rope. 2. Hit the “go” button. 3. Hit the “Return” button. Try it again with either the same amount of men on each side or a different amount of men on each side. 4. Hit the “Reset all” button. Click box next to “sum of forces” and “values,” continue putting men on each side. 5. Hit the “Return” button. Questions ( answer each question in the space provided) 1. How can you make the blue side win? 2. How can you make the red side win? 3. How can you get a tie on both sides? 4. Repeat step 4. Come up with a number sentence or equation we can use to find the sum of the forces. Here are a few suggestions. Fapplied - Ffriction Fapplied + Ffriction 5. If there was only one man pulling the cart what would the sum of forces be? Explain Title: Forces, Friction, and Motion Aim: How does applied force and friction affect the speed of an object? The science concept is: If Sum of forces are not zero, object speeds up or slows down. If zero then its speed is constant. Part I- Motion 1. Click the tab “Motion” 2. Check the boxes next to “ force, values, masses, and speed” 3. Click the pause button. 4. Place a box on the skateboard. Type 200 in the box. The screen should look like this: 5. Press the play button. Count to ten, what happens? (Look at the speedometer) 6. Repeat steps 4 and 5 with the refrigerator. (look at the speedometer) 7. Click the “Reset All” button. 8. Repeat steps 2-4 using different objects and different applied forces. You can also use the people. 9. What happens to the speed, does it slow down as different objects are added and the applied force is different? 10. Why do you think this happens? 11. Is there a sum of forces? 12. How much time does it take for 1 crate, 2 crates, a refrigerator, the man, the girl, and the mystery object, with same applied force get to maximum speed? Maximum speed is reach when the hand on the speedometer cannot go any further. (Record your answers in table below.) Open a new browser and type in this link to use the stopwatch. http://www.online-stopwatch.com/full-screen-stopwatch/ Object 1 crate 2 crates Refrigerator Man Girl Mystery Object Mass Applied force (Newtons) 300N 300N 300N 300N 300N 300N Time (Use stopwatch) 13. Do you think the object’s mass determines how long it will take for that object to reach maximum speed with an applied force of 300 N? Yes or No, Explain your answer. 14. How much do you think the mystery object weighs based on how long it took to reach maximum speed at 300N? Part II-Friction 1. Click the tab “Friction” 2. Check the boxes next to “ forces and speed” 3. Place the refrigerator on the screen. Type 500 in the box. The screen should look like this: 4. What happened? Did the refrigerator move? 5. Click the “Reset All” button. 6. Check the boxes next to “values and speed” 7. Place the refrigerator on the screen. Type 500 in the box. Slide the friction tab toward “None”. 8. What happens as you slide the fiction tab closer to “None”? 9. Click “Reset All”. 10. Check the boxes next to “values and speed” 11. Place any object on the screen.

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