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This is another model that students can use to explore Newton's second law. Students first identify friction as the opposing force and a "push" as the applied force. Through their work with the model, they try to reproduce the conditions of an experiment performed in class.
STELLATM software is needed to view the model in
Mac (hqx) format or PC format.
[Diagram Level | Equations Level | Graphs ]
Displacement(t) = Displacement(t - dt) + (Rate_of_change_of_Displacement) * dt
INIT Displacement = 0 {m}
Rate_of_change_of_Displacement = Velocity
Velocity(t) = Velocity(t - dt) + (Rate_of_change_of_Velocity) * dt
INIT Velocity = 0 {m/s}
Rate_of_change_of_Velocity = Acceleration
Acceleration = Net_force/mass
acceleration_due_to_gravity = -9.8 {m/s^2}
Applied_force = push
coeff_static_friction = 0.5
coeff__kinetic_friction = 0.2
friction = IF Velocity> 0 THEN coeff__kinetic_friction*Weight ELSE coeff_static_friction*Weight
mass = 200 {kg}
Net_force = IF (ABS(Applied_force)>ABS(Opposing_force)) THEN (Applied_force+Opposing_force) ELSE 0
Opposing_force = friction
Weight = mass*acceleration_due_to_gravity
push = GRAPH(time)
(0.00, 0.00), (1.00, 190), (2.00, 390), (3.00, 605), (4.00, 800), (5.00, 985), (6.00, 392), (7.00, 392), (8.00, 392), (9.00, 392), (10.0, 392), (11.0, 392), (12.0, 392)
Time Specs Settings
Standard: Range: 0-12 ; dt = 0.25 ; Integration Method = Euler's
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