Courses
Teacher-curated, self-paced courses. Looking for a guided sequence through a full topic? See Learning Paths.
3 courses
Measurement, Units and the SI System
Physics · High School (11–12) · Units and Measurement
FreeCh 1 · 1/3
A friend says that a road is 5 long and a bag is 3 heavy. You cannot picture either, because there is no unit. In this course we find why physics needs units, we learn the seven base units of the SI system and their prefixes, we change from one unit to another, and we see how people measure a distance as small as an atom and as large as a star.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Accuracy, Errors and Significant Figures
Physics · High School (11–12) · Units and Measurement
FreeCh 1 · 2/3
Measure the same pencil ten times, and you may get ten slightly different numbers. In this course we find why, we learn to say how accurate and how precise a result is, we read a vernier callipers and a screw gauge, we find the error in a result that comes from several measurements, and we write an answer with the right number of significant figures.
4Lessons14Problems2Python Labs1Question Set1Mock Test
Dimensions and Dimensional Analysis
Physics · High School (11–12) · Units and Measurement
FreeCh 1 · 3/3
You can add two lengths, but you cannot add a length to a time. This simple rule is very useful. In this course we write the dimensions of a physical quantity, we use them to check an equation, we use them to find a formula that we do not remember, and we also learn what dimensions cannot tell us.
3Lessons12Problems2Python Labs1Question Set1Mock Test