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In addition to the revision notes for Equations of Motion on this page, you can also access the following Kinematics learning resources for Equations of Motion
|3.8||Equations of Motion|
In these revision notes for Equations of Motion, we cover the following key points:
There are five basic equations of motion: one for the uniform motion and the other four, are for the uniformly accelerated (decelerated motion (motion with constant acceleration. For object moving horizontally, they are:
for uniform motion and
for the uniformly accelerated (decelerated) motion.
When objects move vertically, displacement ∆x⃗ is replaced by the height h⃗ and the horizontal acceleration a⃗ is replaced by the vertical acceleration g⃗, which is otherwise known as the "gravitational acceleration" (as it is caused by the gravity), or "acceleration of free fall." Therefore, the above equations become
If an object is released from a height, we say it is falling freely. There is no initial velocity involved in this kind of motion (which represents a special case of the uniformly accelerated or decelerated motion). Therefore, the four above equations become
When we are interested only in the scalar Kinematic quantities, we only replace ∆x⃗ with s, v⃗ with v, a⃗ with a, h⃗ with h, g⃗ with g without changing the structure of the abovementioned formulae.
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