10. Knowing that the net torque on the meter stick is zero, calculate the location of the second weight on the data sheet. Torque Lab IJ. Place the weight at the calculated location. Is your system balanced? In a different color, show where you needed to move the weights to balance the system. Purpose: To explore the concepts of torque and calculate balancing forces. Working Forward with Three Weights Materials: ring stand, support arm, string, spring scales, weights, meter stick 12. Keep the meter stick support string at the center of gravity. Choose the lighter two of the three of the weights and place them on one side of the meter stick balance. Record the Procedure: weights and locations of the two weights on the data sheet. 1. Record all data on the data sheet. If you run out of space for calculations, attach any 13. Knowing that the net torque on the meter stick is zero, calculate the location of the third additional work to your data sheet. Each student is to hand in their own Inb work. weight on the data sheet. 2. Calibrate your spring scales. 14. Place the weight at the calculated location. Is your system balanced? In a different color, show where you needed to move the weights to balance the system. 3. Use an appropriate spring scale to weigh your meter stick. You can do this by hanging the meter stick from a string and suspending the string from the scale. Unbalanced Meter Stick 4. Set up a ring stand and support arm as demonstrated by your instructor. Hang the meter 15. Move the fulcrum (the string holding up the meter stick) to the 25 cm point. You now stick from the support arm using a string. Make a note of where the string is located on have a weight at the center of mass of the meter stick equal to the weight of the meter the meter stick when it is balanced. This is your center of gravity reading, you will need /stick. Draw your starting point below. this later. 16. Using only a single weight of your choice, calculate where to place the weight so that the system is balanced. Show all your work on the data sheet. Working Backwards with Two Weights 17. Place the weight at the calculated location. Is your system balanced? In a different color, Take two weights, they can be the same or different. Use strings to hang both of the show where you needed to move the weights to balance the system. weights and arrange the weights so that the meter stick is balanced. Draw the arrangement with weights on the data sheet. Be sure to show the location of your Unbalanced Meter Stick 2 fulcrum in each of the diagrams. The fulcrum is shown as a triangle below the scale. 18. Repeat the above experiment using two or three weights and an unbalanced meter stick. 5. Work backwards to show the torque from each of the weights causes a net torque of zero. You may move the fulcrum to any other point except the center of mass. Draw your You will need to use the distance from the fulcrum (string holding the meter stick up) to starting point on the data sheet. each of the weights. Show all of your work on the data sheet. 19. Using any two or three weights of your choice, calculate where to place the weight so Working Backwards with Three Weights that the system is balanced. Show all your work on the data sheet. 7. Choose three weights and repeat the same experiment. This may take a bit of trial and 20. Place the weight at the calculated location. Is your system balanced? In a different color, error. Think and be patient. Draw the arrangement with weights and readings on the data show where you needed to move the weights to balance the system. sheet &. Work backwards to show the torque from all three of the weights causes a net torque of zero. Show all of your work on the data sheet. Working Forward with Two Weights Keep the meter stick support string at the center of gravity. Choose two of the weights, pick one weight and choose a location for that weight. Record the weight and location of that weight on the data sheet. Weight of meter stick : INTorque Lab Data Sheet Working Backwards with Two Weights is Reystance 28 cm 92 cm So 60 70 100 100g sog Fad, = Fgd2 ( 9.) 10. 1 kg ) (0.28 ) = ( 0.05 ) (0.92 ) (9.8 ) 0. 2744 = 0:450% Working Backwards with Three Weights 14 cm 20 cm ring stand 76cm 10 30 So Go 70 80 90 20 d 3 2009 Fg . Fg 2 FgidiFg 202 = Fg3 d3 Fg Ox1 1 9, 8 ) 60, 14) + 0.05 10,20) = 0.219. 8 X(0, 76) 0 , 1 3 7 2 + 0 . 01 = 1, 48 96 0, 1472 : 14896 3Unbalanced Meter Stick - Experimental Mnumerical MITTMITT 30 40 50 70 PO 160 200 Fyd, + igda - Fgd3 ( 0. 20 ) ( 9 8 ) ( d ) = ( 1 1 1 9 . 8 ) ( 0 .5 ) + ( 1 ) (0 . 1 ) (196 ) d = 1 5.9 d = 3.01 m 0 49 ) -7.98 91 rod 3 Unbalanced Meter Stick 24 Fgdz = NumericAL 10 20 Su 60 200 Tog Fgid, = Fazz + Figs3 T (0.20 ) ( 9.2) ( 0.13) = (0.01 ) (9:2)0.17)+(10.375)(1) 10 2548 =0. 391 4606 0. 2548 = 0. Bible6 - 1.9-7m UI2- Ring stand Working Forward with Two Weights 92 0. 46ny = Experimental 40 60 176 100 100% 100g Zoog Fg di = Fgda ( 0. 1 ) ( 9. 8 ) ( d, ) = (0.05 ) ( 9.8 ) (0,92 ) di = ( 0.05 ) ( 9 . 4 ) ( 0. 92 ) 10 6 60 . 1 ) ( 9 8 ) di = 0.46 m Working Forward with Three Weights 2on 4 20 cm 76 cm EG = Numerical 5 = Experimentle 10 30 40 So 160 10 80 20 100 CM 2009 100 50g 200 200g 0.05 Fg z d3 = Fg. di + Fg 2 2 ( 0 2 ) ( 9 . 2 ) ( d 1 ) = ( 0 1 ) ( 9.8) (01 14) +(10 05)(9:8) (0.20 ) "839= 0.1352 9800 148960 1.96 d = 0. 121 m $2cm 4