Relativity, Light Speed & Model Limits — Drills · Grade 12 Science
Chapter: Modern PhysicsWhat these drills covers
By the end of Relativity, Light Speed & Model Limits you should be able to:
- I can define inertial frames, proper time, and proper length.
- I can calculate selected relativistic corrections and state where Newtonian approximations fit.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: inertial frame, proper time, Lorentz factor.
Problem 1
Proper time 4 s andγ=2. Find dilated interval.
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
8 s
2×4=8.
Problem 2
Why does Newtonian mechanics work well for walking-speed motion?
Answer and explanation
v/c is very small, so relativistic corrections are negligible for ordinary precision.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.