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Starting and stopping - pushing and pulling. Sometimes it's easy and sometimes it's difficult. Experiment to find out how force affects movement.
Second Law
This is your chance to experiment for yourself. Try out various combinations, replay the experiments and compare the results. You can make a note of the outcomes using word processing software such as Word. Save your notes and keep a printout if you want to. You can compare your ideas with other students or your teacher.

Crashing Cars