ELECTROMAGNETISM, INERTIA & GRAVITATION: Are they the same?
Last checked: Apr 25, 2026
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Price History
Kindle price over time. Green zones = periods when the book was free.
Price has dropped 2 times over the last 5 months. Goes on sale roughly every 70 days.
Sales Rank
Amazon sales rank: lower number = better selling book. #1 is the bestseller.
Currently around #4,187K in the Kindle store — a niche title. Sales have softened 94% recently.
Rating & Reviews
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Currently ★ from 0 reviews
Sale Prediction
Actual Predicted
Based on past patterns, a price drop could happen soon. It typically goes on sale every 70 days and the last drop was 117 days ago. It has gone completely free in the past.
Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.
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