2019年5月IB物理(SL)真题PDF下载-Paper3
1.In an experiment to measure the acceleration of free fall a student ties two different blocks of masses m1 and m2 to the ends of a string that passes over a frictionless pulley.
pulley1m2mThe student calculates the acceleration a of the blocks by measuring the time taken by the heavier mass to fall through a given distance. Their theory predicts that a=g(m1-m2/m1+m2)and this can be re-arranged to give g=a(m1+m2/m1-m2).
(a)In a particular experiment the student calculates that a = (0.204 ±0.002) ms–2 using m1 = (0.125 ±0.001) kg and m2 = (0.120 ±0.001) kg.
(i)Calculate the percentage error in the measured value of g.
(ii)Deduce the value of g and its absolute uncertainty for this experiment.
(b)There is an advantage and a disadvantage in using two masses that are almost equal.State and explain,
(i)the advantage with reference to the magnitude of the acceleration that is obtained.
(ii)the disadvantage with reference to your answer to (a)(ii).
2.In an investigation a student folds paper into cylinders of the same diameter D but different heights. Beginning with the shortest cylinder they applied the same fixed load to each of the cylinders one by one. They recorded the height H of the first cylinder to collapse.
They then repeat this process with cylinders of different diameters.
The graph shows the data plotted by the student and the line of best fit.
Theory predicts that H=cD2/3 where c is a constant.
(a)Suggest why the student’s data supports the theoretical prediction.
(b)Determine c. State an appropriate unit for c.
(c)Identify one factor that determines the value of c.
2019年5月IB物理(SL)真题余下省略！
你可能还关注