This is one of many models students can build to extend their understanding of Newton's second law. Students first input forces to get the elevator moving up with an initial acceleration and then constant velocity. Later problems involve getting the elevator to stop at an upper floor and finally getting the elevator to return to the bottom floor. Students use an input graph to control the tension in the cable. THE MODEL Vensim Version Vensim PLE Software Right-click to download the model Elevator Model Vensim STELLA Version isee Player Software Right-click to download the model Elevator Model STELLA PC Elevator Model STELLA Mac [Diagram Level | Equations Level | Graphs ] Displacement(t) = Displacement(t - dt) + (Rate_of_change_of_Displacement) * dt INIT Displacement = 0 Rate_of_change_of_Displacement = Velocity Velocity(t) = Velocity(t - dt) + (Rate_of_change_of_Velocity) * dt INIT Velocity = 0 Rate_of_change_of_Velocity = Acceleration Acceleration = Net_force/mass acceleration_due_to_gravity = -9.8 {m/s^2} Applied_force = tension mass = 1000 {kg} Net_force = Applied_force+Opposing_force Opposing_force = Weight Weight = mass*acceleration_due_to_gravity tension = GRAPH(time) (0.00, 10000), (1.00, 10000), (2.00, 10000), (3.00, 9800), (4.00, 9800), (5.00, 9800), (6.00, 9800), (7.00, 9800), (8.00, 9800), (9.00, 9800), (10.0, 9800), (11.0, 9800), (12.0, 9800) Time Specs Settings Standard: Range: 0-12; dt = 0.25; Integration Method = Euler's

Home | Contact | Site Map | Search