Minds On Physics - the App is the mobile version of the popular Minds On Physics Internet Modules found at the publisher's website. Affectionately known as MOPs, this physics learning tool delivers a collection of questions that target students' misconceptions and misunderstandings. Immediate feedback, opportunities for self-correction, and question-specific help abound. MOPs blends the need for careful reading, logical reasoning, and physics understanding in an effort to produce a more confident and able physics student. Part 3 of the 6-part series includes the Momentum and Collisions and the Work and Energy modules. There are 20 missions in all with nearly 600 questions. Each question includes one or more Tutorial screens that provide guidance on the question.