What Is the Difference Between Physics and Chemistry? (Explained for Parents of High Schoolers)
- blogstutorology
- 7 days ago
- 5 min read
Written by Dr. Anil S., PhD Chemistry 8 years teaching high school & college-level science | Fact-checked by Dr. Anil S., PhD Chemistry As a science tutor who has worked with 200+ US students across grades 9–12, I've seen the same question come up every fall: "Should my child take physics or chemistry first?" Here's everything you need to make that call confidently. |
Every August, thousands of US parents stare at their child's course selection sheet wondering: physics or chemistry? Both sound intimidating, both are required for most STEM college programs, and most school counselors offer little more than a shrug. According to College Board AP enrollment data, over 300,000 students sat for AP Chemistry and AP Physics exams in 2023 alone — yet many entered those classrooms without understanding what made each subject distinct.
This guide breaks it down clearly: what each subject actually covers, which is harder, what order makes sense, and how to know which one is right for your child right now.
What Does Each Subject Actually Cover?
Physics: the science of how things move and interact
Physics is the study of matter, energy, motion, and the fundamental forces that govern the universe. In high school, students typically cover mechanics (motion, force, gravity), waves and sound, electricity and magnetism, and introductory modern physics (atoms, radiation). It is highly mathematical — your child will be solving equations constantly.
Think of physics as asking: Why does a ball fall? Why does a circuit work? How does a bridge stay up?
Chemistry: the science of matter and how it transforms
Chemistry is the study of substances — what they're made of, how they combine, and what happens when they react. High school chemistry covers atomic structure, the periodic table, chemical bonding, reactions, stoichiometry, acids and bases, and thermodynamics. It blends conceptual understanding with mathematical problem-solving and lab work.
Think of chemistry as asking: Why does iron rust? What happens when you mix bleach and ammonia? How does medicine work in the body?
Physics vs. Chemistry — At a Glance
Physics • Motion, forces, gravity • Electricity & magnetism • Waves, optics, energy • Heavy algebra & calculus • Abstract, conceptual • Prereq: Algebra 2+ | Chemistry • Atoms, elements, bonding • Chemical reactions • Stoichiometry, acids/bases • Math + memorization • Lab-heavy, hands-on • Prereq: Algebra 1+ |
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Helping students pick the right subject and succeed in it. |
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Which Is Harder — Physics or Chemistry?
The honest answer: it depends on your child's strengths
Neither subject is universally harder. Research published in the Journal of Educational Research found that student performance in high school science is more strongly predicted by prior math ability and study habits than by the subject itself.
Physics tends to be harder for students who: struggle with abstract reasoning, dislike math, or need concrete, visual examples to understand ideas. The conceptual leaps in physics — imagining forces on an invisible object, visualizing electromagnetic fields — can be genuinely difficult.
Chemistry tends to be harder for students who: dislike memorization, struggle to follow multi-step procedural problems, or find lab work stressful. Balancing chemical equations and mastering mole calculations trips up many otherwise strong students.
AP-level difficulty
At the AP level, both are demanding. According to College Board data, the passing rate (score of 3 or above) for AP Chemistry in 2023 was approximately 54%, while AP Physics 1 had a passing rate of around 46% — making Physics 1 the harder AP exam by that measure.
"My son was terrified of physics — he's always been more of a memorizer than a deep thinker. His Tutor-ology tutor helped him see the logic behind the formulas, and he ended up getting a 4 on the AP. I wish we'd started sooner." — Sarah, mom of a 10th grader in Ohio |
Which Should My Child Take First?
The traditional US sequence
Most US high schools follow this order: Biology (9th grade) → Chemistry (10th grade) → Physics (11th or 12th grade). This sequence makes logical sense because physics relies on stronger math skills that students develop over time. The National Science Teaching Association supports this progression for most students.
The "Physics First" movement
Some schools — particularly those following the "Physics First" model championed by Nobel laureate Leon Lederman — teach physics in 9th grade before chemistry or biology. The argument is that physics provides the foundational laws that explain chemistry and biology. If your child's school uses this model, don't worry: studies show students perform comparably regardless of sequence, as long as math support is in place.
If your child has a choice
General guidance: if your child is strong in algebra and logical reasoning → physics is manageable from 10th grade onward. If your child is strong in pattern recognition and enjoys hands-on labs → chemistry is a natural fit at any point after Algebra 1.
For students aiming at pre-med, biology and chemistry are higher priorities. For engineering and physics majors, physics should be taken as early as possible.
Which subject is right for my child? (Interactive quiz on web version) |
Q: My child's strongest skill is: |
A) Strong at math and logical thinking → Physics is likely a strong fit. |
B) Good at memorizing and following steps → Chemistry is often a better starting point. |
C) Fairly balanced → Follow your school's default sequence; get a tutor's input before AP selections. |
Need help navigating AP science course selection? |
Our tutors can help your child build the right plan. |
AP Options Explained for High School Parents
AP Chemistry
AP Chemistry covers college-level general chemistry — reactions, thermodynamics, kinetics, and electrochemistry. It is lab-intensive and requires strong algebra and some pre-calculus. Students who take AP Chemistry and score 3 or above can receive college credit at most US universities, including all Ivy League schools. It is highly recommended for pre-med, pharmacy, environmental science, and chemical engineering pathways.
AP Physics — three tracks
College Board offers three AP Physics options:
AP Physics 1 — algebra-based, introductory level
AP Physics 2 — algebra-based, advanced topics
AP Physics C — calculus-based, the most rigorous track
Students aiming for engineering, physics, or computer science should target AP Physics C. Students wanting a science elective without calculus can take Physics 1 or 2.
Can a student take both?
Yes — many strong STEM students take both AP Chemistry and AP Physics in the same year (typically 11th or 12th grade). This is demanding but doable with good time management and tutoring support. Schools often allow concurrent enrollment.
Frequently Asked Questions
Q: Is physics or chemistry more useful for pre-med students?
A: Both are required for most US medical school applications. Chemistry (especially organic chemistry) is considered more directly relevant, but physics is also on the MCAT and must be completed. Students aiming for medical school should take both, with chemistry typically prioritized first.
Q: Does my child need calculus to take physics?
A: Not for standard or AP Physics 1/2 — those are algebra-based. However, AP Physics C requires concurrent or prior enrollment in calculus. Most high school physics courses require only Algebra 2.
Q: What if my child is struggling in their current science class?
A: Early intervention makes a significant difference. A targeted tutor who specializes in high school science can identify specific gaps — whether it's math foundations, lab report writing, or conceptual understanding — and address them before they compound. Most students see improvement within 4–6 sessions.
Want expert science help for your child? Our tutors specialize in high school physics and chemistry across all US grade levels. |
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