Question

#’s 3 and 4. For clarity in 4, it’s rotating from a 0 degrees position to a 45 degrees position, and from a 315 degree position to a 0 degrees position.

Torque mini-Lab: Part 1 Work together, but each student turns one report in. Experience all the parts of the mini-lab yourself A. Torque Feeler Torque and force are sometimes confused because of their similarities. Their differences should be evident in this activity. Purpose: To illustrate the qualitative differences between torque and force. Equipment: meter stick, clamp to hold weight, lkg weight Procedure Step 1. Hold the end of the meter stick in your hand so that your index finger is at the 5cm mark. With the stick held horizontally, position the mass hanger at the 10cm mark, and suspend the lkg mass from it. Rotate the stick to raise and lower the free end of the stick. Note how hard or easy it is to raise and lower the free end. Step 2: Move the mass to the 20cm mark. Rotate the stick up and down about the pivot point (your index finger) as before. Repeat this procedure with the mass at the 40cm, 60cm, 80cm and 95cm marks. 1. Does it get easier or harder to rotate the stick as the mass gets farther from the pivot point? handin Analysis: 2. Does the weight of the mass increase as you move the mass away from the pivot point your index finger)? 3. If the weight of the mass is not getting any larger, why does the difficulty in rotating the stick increase in Step 2? Explain 4. Predict what would happen if you start Step 1 and 2 at a 45 deg angle rather than at horizontal? Now, repeat the above procedure but starting at 45deg angle. Explain the difference in the difficulty you observed. Draw a free body diagram to help your explanation

Answer 1

difficult increase became the distance hanger from pivot (index finger) increased thus torque of mass with respect to pivot get increased as torque tau = r vector times F vector = rf sin theta f beiner the weight but r being distance b/w hanger & pivot changes It is case A harder to raise because theta increases (0 < theta < 90 degree) materialimplication torque increased In case B to raise is easier because theta approches to 180 degree i.e, sin theta decreases for step-2 it is just variation of r