Dear Students, Please study the theoretical pre-lab materials, check the recommended educational website and YouTube videos given below, and try to follow the step-by-step instruction. If you still have any questions regarding this lab, I will also be available by Skype, Zoom.com video conference or email during our regular class time and beyond in order to provide all the necessary assistance and guidance. Please contact me at liubushka. iu@gmail. com with any questions, but please keep in mind that it might take me some considerable time to respond, especially if I receive too many of your messages at the same time. 1 Theory Newton's law of universal gravitation is usually stated that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers In today's language, the law states that every point mass attracts every other point mass by a force acting along the line intersecting the two points. The force is proportional to the product of the two masses, and inversely proportional to the square of the distance between them. The equation for universal gravitation thus takes the form: F = Gmim2 12 (1) where G = 6.67 . 10-1 Nm?/kg is the gravitational constant, m, and m, are the masses of the objects, and scalar r is the distance between the centers of the masses. The gravity force is inversely proportional to the square of the distance from the center of the body similarly to the Coulomb's interaction between two point electric charges. 2 Useful resources 2.1 Educational websites . https://en. wikipedia. org/wiki/Newton%27s_law_of_universal_gravitation . https://www. toppr . com/guides/physics-formulas/gravitational-force-formula/ . https://www. khanacademy . org/computing/computer-programming/programming-natural-simulat programming-forces/a/gravitational-attraction 2.2 YouTube videos . https://www. youtube. com/watch?v=Ep1j IhHdf2A . https://www. youtube. com/watch?v=OhOuNtRMSAI . https://www. youtube. com/watch?v=NPyfINCcPCo and many-many others available online.3 Procedure 1. Open our present online lab by clicking on https ://phet . colorado . edu/sims/html/gravity-force-la latest/gravity-force-lab_en. html 2. Choose the value m1 = (100 + 5.0N) kg for Mass 1 100 kg , where N is your number in the Mass 1 class roster. Provide the value of the mass you used in your lab report. 3. Change Force values Force Values dot-checkmark on the right from Decimal Notification O Decimal Notation to Hidden O Hidden Mass 2 4. Choose the initial value of Mass 2