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AP Physics formula list (B1) Ch. 2 Motion in one Dimension Displacement: Average velocity (all situations): Average velocity (uniform acceleration): Average acceleration: Kinematic formulas: Kinematic formulas if vi=0: Ch. 3 Motion in two Dimensions x-component y-component (B1) Ch. 4 Laws of Motion Net force: Friction equations: Weight: Static: x and y components (if θ is to horizontal axis): Net force using x and y components: Atwood Machine: Kinetic: (B1) Ch. 5 Work and Energy Work: Net work: Work done against friction: Work done against gravity: Total Energy: Total mechanical energy: Kinetic energy: Gravitational PE: Elastic PE: Power Equations: (B1) Ch. 6 Momentum and Collisions Impulse (IS A VECTOR: you will need signs if vf and vi are different directions, or J is opposite direction of motion): Momentum: Conservation of momentum (IS A VECTOR: you will need signs if vf and vi are opposite directions): Explosion: Elastic Collision: AND: The perfectly elastic equation (use with conservation of momentum: Inelastic Collision: Perfect Inelastic: Glancing collisions: Center of mass: (NOTE: This equation is also used to find the v of the center of mass (com). v f is vcom!) AND: Note: (if θ is to the horizontal!) (chose a common origin for all point masses so all positions (all xi and xcm) are relative to that origin.) (B1) Ch. 7&8 Circular Motion & Torque Linear velocity for an object moving in a circle: Centripetal (radial) acceleration: Centripetal force: Gravitational force between two masses: Orbital motion: Kepler’s Third Law (Good derivation practice from above 3 equations): Pendulum motion/rollercoaster motion: (If not at top or bottom of circle, you might have to find components of Fg (if FT is toward center) or find components of FT (If FT is NOT toward center)) Acceleration due to gravity: Gravitational potential energy between two masses: (This can be used in conservation of energy equation just like mgh) Escape velocity (a good practice in derivation from conservation of energy using the above equation and ½ mv 2: Torque: Equilibrium: θ= angle between force and lever arm Angular Quantities Note: Remember all kinematic angular quantities ( , , ) are multiplied by r to get the linear quantity (d,v,a). All Newtonian Angular quantities ( ,, L ) are divided by r (or r in the case of I) to get the linear quantity (F, m, mv). 2 Angular displacement (1 rev): Angular velocity: Angular to linear velocity conversion: Angular acceleration: Angular to linear acceleration conversion: Angular Mass (?) (a.k.a MOMENT OF INERTIA): Angular Force: Angular momentum: (for orbiting point masses) Angular Impulse(?): Rotational Kinetic Energy: (β=1 for orbiting point masses) (B2) Ch. 9&10 Fluid Mechanics Density: Pressure: Hydraulic (Pascal’s) Principle: Gauge pressure: Absolute pressure: Buoyant force: If floating: (use V of water displaced!) If sinking or completely submerged: (use V of object!) Continuity equation: Bernoulli’s equation: (If P1 is higher than P2, and P1=Patm, then P2=Pabs. BUT, If P1 is set to zero, P2=Pgauge) Torricelli’s equation (STATE IT): Note: There could be a third force such as tension or spring force. (B2) Ch. 12&13 Thermodynamics Linear expansion: Rate of heat transfer by conduction: Work done ON a gas: Internal Energy Equations: (ΔU=0 for a cycle of a cyclical process since ΔT=0) Root mean square velocity: Ideal gas equation: Heat engine: Efficiency equations (%efficiency = e x 100): Carnot Efficiency: (B1) Ch. 14&15 Simple Harmonic Motion (SHM), Vibrations and Waves Hooke’s Law: Displacement of a system in SHM: Velocity of a system in SHM: Velocity MAX: Acceleration of a system in SHM: a MAX: Period of mass/spring system: Wave velocity equations: Wave velocity in a vibrating string: Doppler effect: Period of pendulum: Frequency of standing waves on a string: (at fo, λ=2L) Frequency of standing waves in air column open: (at fo, λ=2L) Frequency of standing waves in air column with 1 closed end: (at fo, λ=4L) Consecutive resonances in a variable length air column with 1 closed end vibrating at frequency f: (B2) Ch. 23 & 24 Light Index of refraction: Snell’s Law: Critical angle: (B2) Ch. 26 Diffraction and Thin Films Double Slit path difference: Constructive (mth maxima): Destructive (mth minima): Equating θ to X and L: Approximation: Single Slit Path difference (DESTRUCTIVE, ONLY): (mth minima): Thin Film: 2-phase shift Constructive: or: Destructive: or: Soap Bubble: 1-phase shift: Constructive: or: Destructive: or: (B2) Ch. 25 Mirrors and Lenses Magnification: Object/image distance equation: Lensmakers’ equation: to see that: (B1 and B2) Ch. 16&17 Electricity Force on a point charge: or: Work done on a point charge: Get this RIGHT! V, U, (include sign of charge) E and F (ignore sign) for POINT CHARGE(S): V, E, Q and C for PARALLEL PLATES: Voltage between the plates: Capacitance equations (If hooked up to a battery: V is constant. If battery is disconnected and capacitor isolated after charging: Q is constant): or Energy stored in a capacitor: Capacitors in series: Capacitors in parallel: (B1 and B2) Ch. 18&19 Resistors and Circuits Current: Resistance: Power equations: Terminal voltage of a battery: Resistors in series: Resistors in parallel: Ohms’ Law: (B2) Ch. 20&21 Magnetism Force on a moving charge in an external B: For charge moving in a circular path in external B: or: Force on a current-carrying wire in an external B: Strength of B due to a wire: Flux equation: Induced EMF in a coil: Motional EMF on a straight wire: Modern Physics Energy of a photon: Photoelectric Effect: Work function: KEmax equation: X-ray emission: Compton Effect: Debroglie Wavelength: or: Bohr Model: Equivalence of mass and energy: Mass defect: Half Life: 1u=931MeV