Black 710 10 2. A student in a physics lab has a block with a fan attached to it, as shown in the figure above. The fan has a pivot so that the angle 8 it makes with the horizontal can be adjusted between 0 and 90". When the fan is pointed so that 0-0, the block accelerates from rest along a track, even though there is friction between the block and the track. For the following questions, assume that the student has access to equipment that would usually be found in a school physics laboratory (a) A Describe an experimental procedure that the student could use to measure the force F that the air exerts on the fan-block system when the fan is turned on. Assume that the magnitude of this force is the same for all angles, 6. What quantities would be measured? measure Distance, time, initial and final velocity and the weight of the block 2 What equipment would be used for the measurements, and how would that equipment be used? Include a labeled diagram of the experimental setup, Scale, meter stick, Stopwatch allnetforce has friction iv. Describe the overall procedure to be used. Give enough detail so that another student could replicate the experiment. measure the distance from when the fonis turned on to where it is shut off. Time how long it takes to travel that distance with the Stopwatch. Measure the blocks weight with the scale. Describe how the force can be determined from the measurements that were described in parts (a) i-iii {F=F-Ff = ma Mass 1 weight acceleration using = Vot+20+2, plugin of object ong Scale measurements Question #2 continued on next page 2 (b) in Describe an experimental procedure that would allow the student to use the fan-block system, with the fan turned on, to find the coefficient of kinetic friction between the block and the track. L What quantities would be measured? distance time, initial and final velocity What equipment would be used for the measurements, and how would that equipment be used? Include a labeled diagram of the experimental setup. Stopwatch, meter STICK, Scale Describe the overall procedure to be used. Give enough detail so that another student could replicate the experiment, measure your block to find multiplying that by g your normal force by On the dot to the right, which represents the fan-block system, draw and label the force (not components) that are exerted on the system during the experiment described in parts (b) i-iii. Represent each force by a distinct arrow starting on and pointing away from the dot. mass 4 (c) No! mg Describe how to analyze the data from the experiment described in parts (b) i-ii in order to determine the coefficient of kinetic friction between the block and the track. Your analysis may include the force F exerted by the air on the fan-block system. Do not add to the free-body diagram in part (b) iv. use calculation of your FN by finding the weight of the block and mutiplying it by g. use your Calculations of FF found in the last experiment and divide it by FN to arrive at your answer for MK