Average and Instantaneous Velocity from Position–Time Graphs | IB/AP/A-Level/GCSE Physics!

Most students draw a line between two points on a position–time graph, find the slope, and call it “the velocity.” But which velocity? Average or instantaneous?

Average and Instantaneous Velocity from Position–Time Graphs | IB/AP/A-Level/GCSE Physics!

In this video, you’ll learn:
• Why a secant line gives average velocity (and when to use it)
• Why a tangent line gives instantaneous velocity (and when to use it)
• The one-word exam filter that tells you which line to draw
• A worked example showing exactly why the two answers differ

This is part of the EPT (Events, Position, Time) series on motion and kinematics.

📋 FREE DIAGNOSTIC: 25 questions, 15 minutes — find your motion graph weak spots
→ https://learn.fundafirsths.com/ept-diagnostic-events-position-time

📚 EPT COURSE: All 8 motion graph traps + worksheets + Mistake Museum + Exam Pack
→ https://learn.fundafirsths.com/payment-options-ept-tmr-bundle

Chapters:
0:00 The trap: wrong line, wrong velocity
0:21 What is a secant?
0:38 Average velocity = interval
0:44 Instantaneous velocity = moment
0:54 Why they differ on curves
1:10 When they match (straight line)
1:21 Exam practice: average velocity
1:32 Solving average velocity
1:45 Solving instantaneous velocity
2:23 Exam checklist: “between” vs “at”

Topics:
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Видео Average and Instantaneous Velocity from Position–Time Graphs | IB/AP/A-Level/GCSE Physics! канала FundaFirst HS