From fc8750f379449d31a11a00a3c2ab53743b0d30f4 Mon Sep 17 00:00:00 2001 From: eggy Date: Tue, 3 Nov 2020 10:53:59 -0500 Subject: [PATCH] phys: define work --- docs/sph3u7.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/sph3u7.md b/docs/sph3u7.md index bf37690..3175c0c 100644 --- a/docs/sph3u7.md +++ b/docs/sph3u7.md @@ -427,7 +427,7 @@ If both objects on both sides of a pulley have the same mass, Newton's third law ### Work -Work is a scalar value measured in **joules** ($\text{J}$) and is equal to the dot product (a special type of multiplication between vectors) of force and displacement, where $\theta$ is the **angle between the two vectors**, such that: +Work is a scalar value measured in **joules** ($\text{J}$) and represents the energy transferred to an object or system. It is equal to the dot product (a special type of multiplication between vectors) of force and displacement, where $\theta$ is the **angle between the two vectors**, such that: $$W=\vec{F}\cdot\vec{d}\cdot\cos\theta$$ When work is done **by** exactly one force, the above is formula is used. However, when calculating for work **on** an object, or **total work**, the sum of all forces ($\Sigma F$) should be used instead of $F$.