How to Pass Physics in College: A Study Plan for Physics 1, Unit by Unit

Here is how to pass physics: stop hunting for the right formula and learn a routine instead. For every problem, name the principle first (forces, energy or momentum), draw the system, solve in symbols, and check the answer's units, sign and size. Then practice on mixed problem sets, because that's how exams arrive.

Physics 1 punishes the habits that get students through other science courses. Exams give you situations you've never seen, so a memorized example rarely transfers. Below: what intro physics covers (checked against two universities' catalogs, OpenStax and College Board), the study habits physics education research backs, a unit-by-unit table with free practice for each topic, and exam tactics.

Exam in a few days? Skip to how to take a physics exam and the catch-up plan.

What Physics 1 covers

"Physics 1" means one of two courses, and the syllabus tells you which:

The topics overlap far more than the math does: both Illinois catalog entries start with Newton's laws, work and energy, then add rotation, fluids and waves. University Physics Volume 1, which says it follows the scope and sequence of most two- and three-semester courses nationwide, runs in this order:

1. Units, vectors and kinematics: measurement, vector components, motion in one and two dimensions, projectiles.
2. Newton's laws: forces, free-body diagrams, friction, circular motion.
3. Energy: work, kinetic and potential energy, conservation of energy, power.
4. Momentum: impulse, conservation of momentum, collisions.
5. Rotation: torque, rotational inertia, angular momentum, rolling, equilibrium.
6. The extras your course may include: gravitation, fluids, oscillations, waves and sound.

Your exams cover whatever your syllabus lists; schools differ most on that last row.

College Board describes AP Physics 1 as equivalent to a first-semester algebra-based college physics course (College Board). Its eight units (kinematics, forces, energy, momentum, torque, rotating systems, oscillations and fluids) match the list above, and AP Physics C: Mechanics, the calculus-based version, uses the same first seven unit names (College Board). So Lykke's free AP Physics 1 course works as a practice bank for the topics both versions of Physics 1 share. It isn't your college's course, and it skips the calculus.

Why Physics 1 is hard

• Beginners see surface features. In a classic study, experts sorting physics problems started from the principle that solves each one, while novices went by the problem's literal features, such as the objects in it (Chi, Feltovich & Glaser, 1981). Two ramp problems can need entirely different physics, and if you learned "the ramp problem" instead of the principle, a ramp with a pulley stops you cold.
• It uses all your math at once. Vector components need sine and cosine; most problems need two equations solved together; the calculus version adds derivatives and integrals. A shaky algebra step sinks a correct setup.
• Intuition fights the physics. Everyday experience says a moving object needs a push to keep moving; Newton's first law says it doesn't, and concept tests such as the Force Concept Inventory probe exactly this. In a survey of 62 intro physics courses (6,542 students), traditional lecture courses closed on average about a quarter of the gap between students' pretest score and a perfect score (average normalized gain 0.23); courses built on interactive engagement closed about half (0.48) (Hake, 1998). You can't choose how your course is taught, but you can study actively: predict, explain, then check.

Check your math before the next unit

Taking calculus alongside? Physics will sometimes use an idea before your math class reaches it; read ahead for that topic only.

How to study for physics: five habits

The general research on spacing and retrieval is in our midterm guide. For physics, it becomes five habits.

1. Run the same four steps on every problem

Both OpenStax textbooks teach a step-by-step problem-solving strategy and return to it chapter after chapter. Combined with Rochester's tips, it comes down to four steps:

1. Name the principle. Before any equation, decide: is this a forces problem, an energy problem, a momentum problem or a kinematics problem? The University of Rochester's study tips for intro physics put it plainly: don't search through your book for "the right equation."
2. Draw the system. A sketch with every force as an arrow, then a free-body diagram for each object. OpenStax calls the free-body diagram essential to solving the problem. Pick axes and a positive direction and write them on the drawing.
3. Solve in symbols. Rochester's tips call it almost always easier and less error-prone to keep quantities as symbols until the end. Symbols show you what cancels and let you check units before any arithmetic.
4. Check the answer. OpenStax: if the units are wrong, an error has been made. Then ask whether the sign and size make sense. A car that accelerates at 300 m/s² is a mistake, not a fast car.

Here's step 3 paying off. A block slides from rest down a frictionless ramp 1.8 m high. Energy conservation gives mgh = ½mv², so v = √(2gh). The mass cancels before you touch a number: v = √(2 × 9.8 × 1.8) ≈ 5.9 m/s for a block of any mass. Plug in numbers on line one and you'd never see that.

2. Shuffle your practice

Textbook problem sets are sorted by section, so you always know which principle a problem wants; exams aren't. At UCLA, about 350 students in an intro physics course for life-sciences majors (electricity, magnetism and modern physics) did eight weeks of homework, half of it interleaved (one problem per topic, topics rotating) and half blocked (one topic at a time). On two surprise tests with new, harder problems, median scores after interleaving were 50% and 125% higher, yet students rated it harder and believed they'd learned less (Samani & Pan, 2021). So don't judge a practice method by how smooth it feels.

Once a week, pull a mixed set of 8–10 problems from every unit so far and write the principle above each one before solving.

3. Study worked examples, then close them

A practice guide from the U.S. Department of Education's research arm recommends alternating worked examples with problems you solve yourself, and pairing diagrams with words; it rates both as backed by moderate evidence (IES). In physics: read one textbook example, close the book, solve a similar end-of-chapter problem, then compare your free-body diagram with the book's before you compare the final number.

4. Answer concept questions out loud

Many physics exams include questions with no numbers: rank, predict, explain. Practice by explaining to a classmate why a heavier block slides down a frictionless ramp no faster than a light one, or why a ball at the top of its flight still has acceleration. If you can't explain it in two sentences, that's the topic to restudy.

5. Keep an error log

Write each miss on one line: the problem, what went wrong, the cause (wrong principle, diagram, algebra, units, sign) and a one-line fix. Redo each problem cold a few days later.

How to pass physics: a unit-by-unit practice plan

Follow your syllabus's order. The AP Physics 1 topic sections below are free, with flashcards, quiz questions and exam-style free-response questions with model answers. The demos let you change a value and watch the motion respond.

Rotation is easier once you see that it mirrors linear motion: torque plays the role of force, rotational inertia the role of mass, angular momentum the role of momentum. The analogy engine demo puts the two side by side.

A week in any unit:

1. Skim the section before lecture (Rochester's tips say to read first). After lecture, work two textbook examples with the solution covered, then the matching section's quiz.
2. Do the homework with the formula sheet only, not the chapter, and log every miss.
3. Midweek, run a shuffled set from earlier units with the principle labeled first.
4. Before the weekend, redo the logged problems that are due and explain one concept question aloud.
5. Two weeks before an exam, switch to the 14-day plan, using your instructor's old exams as practice tests. If they aren't posted, email your professor and ask whether past exams are available.

A common mistake that costs points: the normal force

It's tempting to write the normal force as N = mg in every problem. It's only true for an object on a level surface with no other vertical forces. On a ramp, OpenStax's friction section shows N = mg cos θ, and any push or pull at an angle changes it too. Since friction is μN, a wrong N spoils everything after it.

Worked example: pulling a box at an angle

You pull a 5.0 kg box across a floor with a 20 N force angled 30° above horizontal. The coefficient of kinetic friction is 0.20. What is the box's acceleration? Use g = 9.8 m/s².

1. Principle and system: forces on the box, so Newton's second law along each axis.
2. Free-body diagram: weight mg down (49 N), normal force N up, friction to the left, and the pull split into 20 cos 30° ≈ 17.3 N forward and 20 sin 30° = 10 N up.
3. Vertical axis (no vertical acceleration): N + 10 N − 49 N = 0, so N = 39 N, not 49 N.
4. Friction: f = 0.20 × 39 N = 7.8 N.
5. Horizontal axis: 17.3 N − 7.8 N = (5.0 kg) a, so a ≈ 1.9 m/s².
6. Check: units are m/s²; the answer is positive and smaller than the 3.5 m/s² you'd get with no friction. Reasonable.

Write N = mg and friction becomes 9.8 N, giving a ≈ 1.5 m/s²: about 20% low, and every later part of the problem inherits the error. The AP Physics 1 section on friction has more problems like it.

Other mistakes worth a line in your error log:

• Dropping the sign convention. Pick a positive direction and keep it; with up as positive, a ball thrown up has a = −9.8 m/s² the whole flight, top included.
• Calculator in the wrong mode. Physics angles usually come in degrees; sin 30 in radian mode is about −0.99, not 0.5.
• Mixing units. Convert centimeters and grams to meters and kilograms before you start.
• Conserving kinetic energy through a collision. With no outside force, momentum is conserved in every collision; kinetic energy only in an elastic one.

How to take a physics exam

Find out ahead of time whether you get an equation sheet and what calculator is allowed, then practice with exactly that. A few days before, write a one-page summary of the material (another Rochester tip): each principle, when it applies and its key equation. On the day:

1. Skim everything first and start with the problem you see the principle in fastest.
2. Mark what you're given and what you want. Rochester's tips suggest a check mark beside each given value and underlining the unknown, so you answer the question asked, not a similar one.
3. Draw before you write equations. A labeled free-body diagram often earns partial credit on its own.
4. Show the physics, not just the arithmetic. Write "energy is conserved: mgh = ½mv²" before the numbers, so a grader can follow you.
5. Box answers with units and sensible digits. "5.9 m/s," not "5.9397."
6. Check limiting cases. If an angle goes to 0 or a mass to zero, does your formula do something sensible?
7. Never leave a problem blank. A correct principle, a diagram and the right starting equation are often worth points.

For timed practice beyond your old exams, the AP Physics 1 practice pages work through exam-style tasks step by step: AP Practice 2 covers forces, friction and circular motion, and AP Practice 5 shows how to derive before substituting.

What changes in Physics 2

Physics 2 trades mechanics for fields. Illinois's calculus-based PHYS 212 runs from Coulomb's law and Gauss's law through circuits, magnetic fields and induction to electromagnetic waves and optics; Ohio State's Physics 1251 adds waves and quantum mechanics. The habits carry over: an electric force still goes on a free-body diagram, and electric potential energy still obeys conservation of energy. Fields are harder to picture than blocks, so draw field lines and circuit diagrams for every problem. The free High School Physics sections on static electricity and DC circuits make a gentle first pass.

How to catch up in Physics 1

If you're behind, work from the next exam backward rather than restarting at chapter 1. Rochester's advice for this case: skim what you missed for its main points, then study the current material thoroughly.

1. List what the next exam covers and make that the whole plan.
2. Rebuild forces first. Free-body diagrams and Newton's second law show up in energy, momentum and rotation problems, so they're worth extra hours.
3. For each topic, one example and three problems: read one worked example, close it, solve three similar problems, log the misses.
4. Take your error log to office hours or the physics help room this week, and ask where your reasoning broke, not for the answer.
5. Do the grade math from the syllabus weights. If the numbers don't work, read our guide on whether to drop a class and talk to your advisor before the withdrawal deadline.