Measurement, units and uncertaintyIB MYP Physics: Mind map

Exam questions on Measurement, units and uncertainty

1. A student in Nairobi is helping to set up a school sports day. She measures the length of the running track as 24 000 mm and the mass of the winner's trophy as 2.5 kg.
   State the SI unit, with its symbol, for force and for pressure.2 marks
2. Amara and Luis each time 20 swings of the same pendulum with a stopwatch. A laser timer shows the true time is 28.4 s. Amara's four readings are 31.2 s, 31.3 s, 31.2 s and 31.3 s. Luis's four readings are 27.1 s, 29.8 s, 28.0 s and 29.6 s.
   Calculate the mean of Luis's four readings. Give your answer to one decimal place.2 marks
3. A class in Lisbon investigates how far a spring stretches when masses are hung from it. They hang masses from 100 g to 500 g, one at a time, and measure the length of the spring with a 30 cm ruler marked in millimetres. They will plot a graph of their results.
   Identify the independent variable, the dependent variable and one control variable in this investigation.3 marks