This is a free, online textbook that is part of the Light and Matter series. This book covers the following topics: Introduction and Review, 1. Scaling and Order-of-Magnitude Estimates, 2. Velocity and Relative Motion, 3. Acceleration and Free Fall, 4. Force and Motion, 5. Analysis of Forces, 6. Newton's Laws in Three Dimensions, 7. Vectors, 8. Vectors and Motion, 9. Circular Motion, and 10. Gravity.