Learn Momentum, Rotation and Gravity: 118 Mechanics Flashcards from Impulse to Escape Velocity
Learn momentum, collisions, torque, angular momentum, Kepler's laws and escape velocity with 118 mechanics flashcards, plus a rotation cheat sheet.
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Momentum, rotation and gravity are the three ideas that turn first-semester mechanics from "F = ma" into real problem-solving. The Mechanics: Momentum, Rotation & Gravity deck (code LF5325, 118 cards) covers all three in one pass. Here is how to get the most out of it.
Study this deck: Mechanics: Momentum, Rotation & Gravity
1 / 10Physics
Tap the card for the answer · swipe right if you knew it, left if not
How the deck is organized
The cards aren't shuffled by topic, so knowing the layout saves time:
- Cards 1-60, momentum and collisions: impulse, conservation, elastic vs inelastic, coefficient of restitution, explosions, center of mass, plus a refresher on Newton's three laws.
- Cards 61-78 and 97-106, rotation: angular velocity (ω), angular acceleration (α), torque, moment of inertia, τ = Iα, L = Iω, rolling without slipping, the parallel axis theorem, gyroscopes and precession.
- Cards 79-96 and 107-117, gravitation: universal gravitation, G, field strength, Kepler's three laws, escape velocity, satellites, weightlessness, tidal force and gravitational lensing.
You'll also review: perfectly inelastic collisions, 1D and 2D collisions, airbags and crumple zones, centripetal force and acceleration, v = rω, a = rα, rotational kinetic energy, radians, period and frequency, mass vs weight, the right-hand rule and the inverse square law.
Cards worth knowing cold
| Front | Back |
|---|---|
| Impulse-momentum theorem | Δp = FΔt |
| Why do airbags reduce injury? | They stretch the time of the momentum change, lowering the force (F = Δp/Δt) |
| Coefficient of restitution of 0 | Perfectly inelastic: objects stick together |
| Moving object hits a stationary equal mass, elastic | The first stops, the second takes its velocity |
| Rotational equivalent of Newton's second law | τ = Iα |
| Parallel axis theorem | I = I_cm + md² |
| Kepler's second law | Equal areas in equal times (conservation of angular momentum) |
| Earth's escape velocity | About 11.2 km/s |
| Why do astronauts appear weightless? | They are in continuous free fall with their spacecraft |
Study tips specific to this deck
Build a linear-to-rotational translation table. Rotation is easier once you see it as a copy of linear motion: x → θ, v → ω, a → α, m → I, F → τ, p → L, ½mv² → ½Iω². Make a single card for each pair and drill them in both directions. Rotation questions then become "linear question, new symbols."
Merge the duplicates, then add numbers. Several concepts appear twice (momentum at cards 4-5, kinetic energy at 43-44, torque at 66-67, angular momentum at 71-72, impulse at 11, 12 and 53). Keep the version that gives the formula and suspend the other. The deck also has almost no worked problems: every card states a rule but none asks you to compute. Write 5-6 of your own, for example "2 kg at 3 m/s hits 1 kg at rest and they stick: final speed?" (answer: 2 m/s). That's what exams actually test.
One correction: card 93 says a geosynchronous orbit matches a 24-hour rotation. Earth's true rotation period (the sidereal day) is about 23 h 56 min, and that's the period a geosynchronous satellite matches.
Where it fits
This deck picks up where Kinematics and Newton's Laws stops. Study that one first if F = ma isn't automatic yet.
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