Richard Feynman
Six Easy Pieces
The thing is though that while the Lectures on Physics are still a valuable resource for those wishing to learn physics, I would think that if a beginner needs motivation, then it should be something more up to date - these lectures were over 30 years old when the book was published, and predate black holes and quarks. This book may have value to those trying to decide whether to invest in the full Lectures on Physics, and to those wishing to study Feynman's style of lecturing. However, I would suggest that anyone wanting an introduction to modern physics would do better with a more recent work.
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