Physics study guide
This guide is designed to help you understand the core ideas that commonly appear in introductory college Physics courses. Read the explanation, follow the example, then try the practice questions without looking back. The goal is to understand the reasoning—not just memorize an answer.
Course requirements vary by school and instructor. Use this as a learning and review resource alongside your assigned textbook, lectures, and instructor guidance.
Motion & kinematics
Concept: Kinematics describes position, velocity, and acceleration without focusing on the forces causing motion.
Worked example: An object changing velocity from 0 to 20 m/s in 4 s has average acceleration 5 m/s².
Remember: Focus on the central relationship in motion & kinematics, define the important terms, and connect each step to the evidence, rule, formula, or process being used.
Common mistakes: Common mistakes include memorizing motion & kinematics without understanding when it applies, skipping units or definitions, and giving an answer without showing the reasoning that supports it.
Practice it
- Explain motion & kinematics in your own words.
- Use the lesson idea to create or solve one new physics example.
- What is one common mistake a student should avoid when working with motion & kinematics?
Forces & Newton laws
Concept: Newton’s laws connect force, mass, and acceleration and explain inertia and action-reaction pairs.
Worked example: A net force of 12 N on a 3 kg object produces 4 m/s² acceleration.
Remember: Focus on the central relationship in forces & newton laws, define the important terms, and connect each step to the evidence, rule, formula, or process being used.
Common mistakes: Common mistakes include memorizing forces & newton laws without understanding when it applies, skipping units or definitions, and giving an answer without showing the reasoning that supports it.
Practice it
- Explain forces & newton laws in your own words.
- Use the lesson idea to create or solve one new physics example.
- What is one common mistake a student should avoid when working with forces & newton laws?
Work & energy
Concept: Work transfers energy; kinetic and potential energy help track motion when forces act over distance.
Worked example: A 2 kg object moving 3 m/s has kinetic energy 1/2(2)(3²)=9 J.
Remember: Focus on the central relationship in work & energy, define the important terms, and connect each step to the evidence, rule, formula, or process being used.
Common mistakes: Common mistakes include memorizing work & energy without understanding when it applies, skipping units or definitions, and giving an answer without showing the reasoning that supports it.
Practice it
- Explain work & energy in your own words.
- Use the lesson idea to create or solve one new physics example.
- What is one common mistake a student should avoid when working with work & energy?
Momentum
Concept: Momentum equals mass times velocity and is conserved in isolated systems.
Worked example: A 2 kg cart at 4 m/s has momentum 8 kg·m/s.
Remember: Focus on the central relationship in momentum, define the important terms, and connect each step to the evidence, rule, formula, or process being used.
Common mistakes: Common mistakes include memorizing momentum without understanding when it applies, skipping units or definitions, and giving an answer without showing the reasoning that supports it.
Practice it
- Explain momentum in your own words.
- Use the lesson idea to create or solve one new physics example.
- What is one common mistake a student should avoid when working with momentum?
Electricity & circuits
Concept: Voltage, current, and resistance are related by Ohm’s law, V=IR.
Worked example: A 12 V source across 4 Ω gives 3 A of current.
Remember: Focus on the central relationship in electricity & circuits, define the important terms, and connect each step to the evidence, rule, formula, or process being used.
Common mistakes: Common mistakes include memorizing electricity & circuits without understanding when it applies, skipping units or definitions, and giving an answer without showing the reasoning that supports it.
Practice it
- Explain electricity & circuits in your own words.
- Use the lesson idea to create or solve one new physics example.
- What is one common mistake a student should avoid when working with electricity & circuits?