Simple Machine – Pulley Block

1003 Words5 Pages
Title: Simple machine – pulley block Date: 21/04/2010 Theory: The objective of the experiment is to calculate the velocity ratio and mechanical advantage for different pulley arrangements. Formulae associated with the experiment are: Mechanical Advantage = M.A. Velocity Ratio = V.R. = 2) Results of experiment: Results: The velocity ratio of the pulley system is equal to the number of active ropes between the sheaves. Therefore: Type of pulley arrangement Velocity Ratio Figure 1 1 Figure 2 2 Figure 3 4 Fig. 1 Fig. 2 Fig. 3 Pulley arrangement shown in Fig.1 Load [kg] %error for load [%] Load [N] Effort [N] %error for effort [%] M.A. %error for ‘M.A.’ [%] V.R. % Efficiency %error for ‘%efficiency’ [%] 0.5005 0.020 4.91 5.25 0.191 0.93 0.211 1 93.0 0.211 0.6012 0.017 5.90 6.25 0.160 0.94 0.177 1 94.0 0.177 0.7023 0.014 6.90 7.25 0.138 0.95 0.152 1 95.0 0.152 0.8002 0.013 7.85 8.25 0.121 0.95 0.134 1 95.0 0.134 0.9015 0.011 8.84 9.25 0.108 0.96 0.119 1 96.0 0.119 1.0000 0.010 9.81 MAXED OUT N/A N/A N/A 1 N/A N/A Pulley arrangement shown in Fig.2 Load [kg] %error for load [%] Load [N] Effort [N] %error for effort [%] M.A. %error for ‘M.A.’ [%] V.R. % Efficiency %error for ‘%efficiency’ [%] 0.5004 0.020 4.91 3.50 0.286 1.40 0.306 2 70.0 0.306 0.6014 0.017 5.90 4.20 0.238 1.41 0.255 2 70.5 0.255 0.7026 0.014 6.89 4.60 0.217 1.50 0.231 2 75.0 0.231 0.8040 0.012 7.89 5.10 0.196 1.57 0.208 2 78.5 0.208 0.8977 0.011 8.81 5.60 0.179 1.57 0.190 2 78.5 0.190 0.9989 0.010 9.80 6.10 0.164 1.61 0.174 2 80.5 0.174 Pulley arrangement shown in Fig.3 Load [kg] %error for load [%] Load [N] Effort [N] %error for effort [%] M.A. %error for ‘M.A.’ [%] V.R. % Efficiency %error for ‘%efficiency’ [%] 0.5001 0.020 4.91 5.00 0.200 0.98 0.220 4 24.5 0.220 0.5967 0.017 5.85 5.80 0.172 1.01 0.189 4 25.3 0.189 0.6978

More about Simple Machine – Pulley Block

Open Document