From 6d195c47a045d045ce5aeb7175bd3edff0a8defc Mon Sep 17 00:00:00 2001 From: eggy Date: Tue, 29 Sep 2020 21:24:21 -0400 Subject: [PATCH] phys: add velocity --- docs/sph3u7.md | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/docs/sph3u7.md b/docs/sph3u7.md index 85eadf5..f6a0c9e 100644 --- a/docs/sph3u7.md +++ b/docs/sph3u7.md @@ -253,6 +253,18 @@ A **scientific model** is a simplification of a system based on assumptions that - **System**: An object or a connected group of objects. - **Point particle assumption**: An assumption that models a system as a blob of matter. It is more reliable if the size and shape of the object(s) do not matter much. +### Velocity + +Velocity is the vector of the rate of change of *displacement* over time. + +The *average* velocity of an object is the velocity over an interval in time, calculated by finding the slope of the **secant** from the start and end position on a position-time graph. + +The *instantaneous velocity of an object is the velocity at a specific moment in time, calculated by finding the slope of the **tangent** at that moment on a position-time graph. + +!!! definition + - A **secant** is a straight line which intersects two points on a curve. + - A **tangent** is a straight line that does not intersect a curve but "touches" it at exactly one point. + ### Displaying motion Motion can be expressed visually in many different ways.