1.3 (e)
Demonstration
Start with diagrams of the pullies and discuss what will happen and move onto how high the mass will eventually rise, you can even give them some values to use in a calculation. Then do the experiment to answer their predictions. Use the data logger to plot velocity against time so that they use the kinetic energy to find the final height that the mass will get to. Finally set the datalogger to measure distance travelled against time to find the result.
Resources
Research into the understanding of Newton I
Analysis
Initially use F=ma to find the acceleration. Then use v^2=u^2+2as to find the upward velocity and then s=ut+0.5at^2 to find how high the mass will go. Once you have a graph of velocity against time you can use the conservation of energy to work out how high the mass will travel.
Equipment
1x PASCO pulley ( PASCO Atwood's machine ), 2x large masses, 1x small mass, 1x long string, 1x ruler
Safety
Keep clear of the ropes and masses when they are moving.
