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Miami Dade College/North Campus PHY1004L, PHY2053L, and PHY2048L Lab 6 “Investigating Static and Kinetic Frictions.” Name Date Whenever two surfaces that are in contact with each other try to move pass one another there is a force that resists the motion. In some case you could push on an object trying to move it and the object doesn’t move. The force of static friction fs balances your force. This is because in order to move an object you need to apply a force larger or equal to the maximum possible static friction, fsmax .Once moving the object still offers some resistance and if you stop pushing the object will immediately start to slow down to a stop, the force responsible for this behavior is the force of kinetic friction, fk. In this experiment, you will use a Force Sensor to study static friction and kinetic friction on a tray. Purpose: To find the graphical and mathematical relationship between the forces of maximum static and kinetic frictions and the normal force on the objects, as to determine the coefficients of static and kinetic frictions for the surface being studied. Materials: • Computer with Logger Pro; • Mass sets; • Lab Pro with dual range force sensor; • String; • Ramp; • Trays. Preliminary questions: 1.In pushing a heavy box across the floor, is the force you need to apply to start the box moving greater than, less than, or the same as the force needed to keep the box moving? Explain your answer. 2.How do you think the force of friction is related to the weight of the box? Explain. 3.Create a force or free body diagram for the case when you are pushing on the box without moving it and when it slides across the floor at a constant velocity. 1 Miami Dade College/North Campus PHY1004L, PHY2053L, and PHY2048L Procedure: Part I Practice Pulling. 1. Measure the mass of the tray and record it in the data table. 2. Connect the Dual-Range Force Sensor to Channel 1 of the interface. Set the range switch on the Force Sensor to 50 N. 3. Hold the Force Sensor in position as ready to pull the block, but without the string. Click Force Sensor to zero. to set the 4. Tie string on the tray to the hook on the Force Sensor. Place a total of 200g mass on top of the block, fastened so the masses cannot shift. Practice pulling the block and masses with the Force Sensor using this straight-line motion: Slowly and gently pull horizontally with a small force. Very gradually, increase the force until the block starts to slide, and then keep the block moving at a constant speed. 5. Click to begin collecting data. Pull the block as before, taking care to increase the force gradually. Repeat the process as needed until you have a graph that reflects the desired motion, including pulling the block at constant speed once it begins moving. 6. Copy the force vs. time graph for the force you felt on your hand. Label the portion of the graph corresponding to the block at rest, the time when the block just started to move, and the time when the block was moving at constant speed. Part 2 Measuring Maximum Static Friction and Kinetic Friction In this section, you will measure the peak static friction force and the kinetic friction force as a function of the normal force on the block. In each run, you will pull the block as before, but by changing the masses on the block, you will vary the normal force on the block. 7. Remove all masses from the block. 8. Click to begin collecting data and pull as before to gather force vs. time data. 9. Examine the data by clicking the Statistics button, . The maximum value of the force occurs when the block started to slide. Read this value of the m

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