This paper is a suggested lecture to introduce forces and accelerations in an introductory engineering physics class. It explains why acceleration is at the heart of physics using the ideas of Galilean transformations and the invariance of acceleration, where forces come from using experimental observations of the accelerations of the moon, an apple, charged balloons, iron magnets, protons, and neutrons, and then goes onto a brief outline of the modern view of forces between fundamental particles by introducing the ideas of virtual particles and field theory.