PRELIMINARY QUESTIONS 1. In everyday life, you often experience one object slidi

Question

PRELIMINARY QUESTIONS 1. In everyday life, you often experience one object sliding against another. Sometimes tho s 2. Consider a box sitting on a table. It takes a large force to move it at constant speed List a 3. In pushing a heavy box across the floor, is the force you need to apply to start the box movi easily and other times they do not. List some things that seem to affect how easily object slide. least two ways you could reduce the force nceded to move the box at constant speed greater than, less than, or the same as the force needed to keep the box moving? On what a vou basing your answer? Part I Starting Friction Check out a set of masses: 500g x 2. 100g x 2 (total 4 pieces). Note: Return all masses to their correct boxes Failure to do so will mean you forfeit all your points 1. Measure the mass of the block and record it in the data table. 2 She e switch ohe Dalag Force Sensor to 10 N. Connect the Fonce Semer s 3. Open the file "12a Static Kinetic Frict from the Physics with Vernier folder 4. Tie one end of a string to the hook on the Force Sensor and the other end to the hook on the Channel 1 of the interface wooden block. The larger wood surface of the block should be in contact with the table. Plact a total of mass of I kg on top of the block. Before you collect data, practice pulling the Block and masses with the Force Sensor using a straight-line motion: Slowly and gently pull horizontally with a small force. Very gradually, taking one full second, increase the force until the block starts to slide, and then keep the block moving at a constant speed for another second 5. Sketch a graph of foroe ys, ime 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 t time when the block was moving at constant speed Force Sensor in position, ready to pull the block, but with no tension in the string Click to set the Force Sensor to zero Click Cctei 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 motion, including pulling the block at constant spced once it begins moving Print or cog graph for use in the trees by selecting only the pages that you really want to print. ysis portion of this activity. NOTE When printing graphs, s e e Part i Peak Static Friction and Kinetic Friction to this part, you will measure the peak static friction force and the kinetic friction force as a function of the normal force on the block, as shown in Figure 1. In each block as before, but by changing the masses on the block, you will block vary the normal force on te cue you wil pull te 8. Remove all masses from the block

Explanation / Answer

1 Some time they slip easily because force of friction between them is low and when this force of friction between them become high then it is vey difficult to slip. Magnitude of this friction depends on two thing

a. Mass of object b. Coefficient of friction between surface

2. a. Applying lubricant to the surface will decrease the friction coeffient and hence decreases friction force

b. By tilting table decreases its "Normal Force" and hence decreases friction force.

3. Initially we have to apply greater force to start motion in comparison to force apply during motion because coefficient of static friction is more in comparison to coefficient of kinetic friction.

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