F=ma using ticker timer

... Physics Investigation: F = ma using a Ticker Timer Data Collection and Processing: Mass of trolley - (496.70±0.01)g m/g ML/g M/(±0.01)g t/s s/(±0.05)cm a/ms-2 ?a/ms-2 F/N ?F/N 100 300 796.70 0.36 10.20 1.57 ±0.015 1.25 ±0.012 150 250 746.70 0.36 10.20 1.57 ±0.015 1.17 ±0.011 200 200 696.70 0.36 12.30 1.90 ±0.015 1.32 ±0.011 250 150 646.70 0.36 13.60 2.10 ±0.015 1.36 ±0.010 300 100 596.70 0.36 16.80 2.59 ±0.015 1.55 ±0.009 Key Sample Calculations m is the mass that hangs from the pulley. - ML is the load on the trolley. - M is the total mass of trolley. M = 496.70 + ML First row: M = 496.70 + 300 = 796.70g t is the time taken for 18 ticks. time between ticks - 0.02s. For all: t = 18 × 0.02 = 0.36s. s is the length for 18 ticks. - a is the actual acceleration of the trolley. s = ut +at2 ? a = First row: a = = 1.57ms-2 ?a is the absolute uncertainty of a. ?a = First row: ?a = = ±0.015ms-2 (2s.f) F is the net force acting on trolley. F = Ma First row: F = = 1.25N ?F is the absolute uncertainty of F. ?F = First row: ?F = = ±0.012N (2s.f.) Attached is the graph of a/ms-2 against F/N. The first value, (1.25, 1.57) is rejected

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