Uniform Motion
Overview
Uniform motion (eenparige beweging) means constant velocity: acceleration = 0. The x–t graph is a straight line (slope = velocity). The v–t graph is a horizontal line. No net force is required to maintain this state (Newton's 1st Law). Example: a car cruising at constant speed on a straight road.
What is uniform motion?
Uniform motion (eenparige beweging) means constant velocity: both magnitude (speed) and direction are unchanged. This requires zero net force (Newton's 1st Law). The object moves equal distances in equal time intervals. Example: a car at constant 30 m/s on a straight motorway, or a ball rolling across a frictionless surface.
Equations and graphs
For uniform motion: displacement s = v · t (only one equation needed). On an x–t graph, uniform motion is a straight line; the slope equals velocity. On a v–t graph, uniform motion is a horizontal line (constant velocity); the area under it equals displacement. On an a–t graph, the line is at zero — no acceleration.
- ⚠Confusing uniform motion (constant velocity) with uniform acceleration (constant acceleration) — they are different
- ⚠Using SUVAT equations for uniform motion — you only need s = vt when a = 0
- ⚠Thinking a curved x–t graph means uniform motion — it means changing velocity (acceleration)
Active Recall Check
Close the lesson and answer 3 quick questions from memory. This is the most effective way to lock in what you just read.