Circular Motion and Centrifugal Force Experiment in - mit blossoms：圆周运动的离心力试验在麻省理工学院的花朵.docx

Experiment #1Experiment Title: Verifying Motion Direction of an Object in the Absence of CentripetalForceObjective: Determinethe motion direction of an object in the absence of centripetal force (Proving non-existence of Centrifugal Force)Apparatus:Plastic tube (i.e. a pen, after removing the ink cartridge so that it is open from both sides)Two metersof string50g OR 100g hooked mass(A mass that can be tied with a rope)Small iron nail, a toothpick or a small plastic ballProcedure:Tie a hooked mass with a string.Insert the other side of the string into the plastic tube until about half of the string is inserted.Tie a light nail (or a toothpick or a small plastic ball) with the other side of the string. (The purpose of this is to prevent pulling the rope from the tube during the circular motion of the metal mass).Hold the plastic tube from the middle of the string.Rotate the metal mass in a horizontal circular motion above your head while keeping the hanging side with the nail steady in the other hand.(As in the figure).At a certain point for the metal mass and while rotating, let go of the string. Observe the motion direction of the metal mass.Repeat the experiment several times to confirm the correct direction.Safety Remarks:Wherever you conduct the experiment, ensure that you are at a safe distance from people, windows, doors, furniture, etc.Make sure that you tied the mass and the nail firmly so that it cannot escape during motion.Conclusion:Write adescription for the metal mass motion after releasing it from uniform circular motion.Additional Question:From this experiment, draw the direction of motion of the metal mass movement when releasing it in the following positions:Rotation directionRotation directionExperiment #2Experiment Title:Centripetal ForceObjective: Calculate centripetal force during uniform circular motion.Compare centripetal force with another known force.Apparatus:Plastic tube (i.e. a pen, after removing the ink cartridge so that it is open from