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COMPOSITION OF WEIGHTS
ADDITIVITY OF FORCES IN OPPOSITE DIRECTIONS
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action add a weight angle bisector causality centimetres centre Chapter child close composition of forces correct difference elastic band Experiment explanation Fl and F2 force of propulsion four weights goes heavier hold back hook horizontal III2 III3 it's heavier it's pulling Jean Piaget knot length less heavy let go Level IIB little bit longer Look exp middle missile move non-additivity notion number of weights observed opposing forces opposite Fl opposite the bisector P2 and P3 parallelogram of forces position post-test pre-test predicts equilibrium predicts imbalance problem pulleys pulls less push put three puts the weight Question III1 Questions on direction questions on magnitude reactions remain remove resultant ring go ring stays ring will go ruler says side six weights space straight line stretch the elastic subjects symmetry thread three weights thumb-tack tray vertical weight opposite weights at Fl weights pull