Podcast
Questions and Answers
Match the following terms with their definitions in oscillatory motion:
Match the following terms with their definitions in oscillatory motion:
Kinetic Energy = Energy associated with motion Potential Energy = Energy stored due to position Acceleration = Rate of change of velocity Mass = Amount of matter in an object
Match the following equations with their corresponding physical concepts:
Match the following equations with their corresponding physical concepts:
$F_{spring,x}= -k * x$ = Hooke's Law for springs $E_{total} = K + U_{elastic}$ = Total mechanical energy of oscillating system $v_{max} = A / ext{m}$ = Maximum speed at midpoint of oscillation $x(t) = A \cos(t)$ = Displacement in simple harmonic motion
Match the following types of oscillations to their characteristics:
Match the following types of oscillations to their characteristics:
Under-damping = Completes a single oscillation with decreasing energy Overdamping = Never completes a single oscillation Driven oscillations = Oscillates at the driving frequency Damping = Gradually reduces total mechanical energy
Match the following symbols with their physical quantities:
Match the following symbols with their physical quantities:
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Match the following conditions with their outcomes in oscillations:
Match the following conditions with their outcomes in oscillations:
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Match the following spring dynamics concepts with their expressions:
Match the following spring dynamics concepts with their expressions:
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Match the following terms with their respective forces in driven oscillations:
Match the following terms with their respective forces in driven oscillations:
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Match the following pendulum concepts with their equations:
Match the following pendulum concepts with their equations:
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Match the following thermal phenomena with their descriptions:
Match the following thermal phenomena with their descriptions:
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Match the following temperature scales with their important characteristics:
Match the following temperature scales with their important characteristics:
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Match the following heat units with their values:
Match the following heat units with their values:
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Match the following thermal expansion formulas with their concepts:
Match the following thermal expansion formulas with their concepts:
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Match the following laws with their descriptions:
Match the following laws with their descriptions:
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Match the following specific heat capacity components with their symbols:
Match the following specific heat capacity components with their symbols:
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Match the following types of conduction with their characteristics:
Match the following types of conduction with their characteristics:
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Match the following energy transport mechanisms with their speed:
Match the following energy transport mechanisms with their speed:
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Match the following definitions with their terms:
Match the following definitions with their terms:
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Match the wave types with their characteristics:
Match the wave types with their characteristics:
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Match the terms with their definitions:
Match the terms with their definitions:
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Match the type of wave interference with its description:
Match the type of wave interference with its description:
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Match the wave concepts with their formulas:
Match the wave concepts with their formulas:
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Match the types of standing wave nodes and antinodes with their characteristics:
Match the types of standing wave nodes and antinodes with their characteristics:
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Match the properties of sound waves with their effects:
Match the properties of sound waves with their effects:
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Match the Doppler effect scenarios with their outcomes:
Match the Doppler effect scenarios with their outcomes:
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Match the wave phenomena with their descriptions:
Match the wave phenomena with their descriptions:
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Match each wave category with an example:
Match each wave category with an example:
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Match the descriptors to the type of wave:
Match the descriptors to the type of wave:
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Match the wave characteristics with their effects during a transition between mediums:
Match the wave characteristics with their effects during a transition between mediums:
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Match the terms related to wave mechanics with their functions:
Match the terms related to wave mechanics with their functions:
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Match the acoustic variables with their definitions:
Match the acoustic variables with their definitions:
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Study Notes
Mass on a Spring Dynamics
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Hooke's Law: Force exerted by a spring is proportional to its displacement from equilibrium: Fspring, x= -k * x (where k is the spring constant).
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Acceleration: If only the spring force acts, acceleration is proportional to displacement: ax= -km*x (m is mass).
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Forces & Acceleration: Maximum force and acceleration occur at the endpoints of oscillation; zero force and acceleration at the midpoint (x=0).
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Kinetic Energy: K= 12mv^2
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Potential Energy (Elastic/Spring): Uelastic or Uspring= 12kx^2
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Total Mechanical Energy: Etotal = K + Uelastic = 12kA^2 or 12mvmax^2 (where A is the amplitude of oscillation, vmax is the maximum speed).
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Conservation of Energy: In a frictionless system, the total mechanical energy is conserved.
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Maximum Speed: vmax = A√(k/m) at the midpoint of oscillation.
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Velocity at any position: vx = √(k/m)(A^2-x^2)
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Natural Frequency & Period: f0= 12√(k/m) ; T0= 2π√(m/k)
Mass on a Spring Kinematics
- Period & Frequency: T = 1/f; T=2π √(m/k)
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Oscillation Equations:
- Displacement/position: x(t) = Acos(ωt) (where ω= 2πf = 2π√(k/m))
- Velocity: v(t) = -ωAsin(ωt) = -vmaxsin(ωt)
- Acceleration: a(t) = -ω^2Acos(ωt) = -amaxcos(ωt)
- Phase Relationship: The displacement, velocity, and acceleration are each 1/4 cycle out of phase with the next.
Pendulum Energy
- Kinetic Energy: K=12mv^2
- Potential Energy (Gravity): Ugrav=mgy (y = 0 at the bottom of the swing).
- Total Mechanical Energy: Etotal = K + Ugrav = mgymax = 12mvmax^2 , evaluated at endpoints and midpoint.
- Maximum Speed: vmax =√(2g*ymax)
- Endpoints and Midpoint Energy: Total energy is conserved everywhere in the oscillation, including at the endpoints (maximum potential energy) and the lowest point (maximum kinetic energy)
Dampened Oscillations
- Damping: A function that performs negative work, reducing mechanical energy (E) gradually.
- Overdamping: System never completes a single oscillation. Example: shock absorbers.
- Underdamping: System oscillates with decreasing amplitude and maximum speed per oscillation, maintaining a constant frequency (and unchanged period).
Driven Oscillations & Resonance
- Driving Force: A periodic force causing oscillation at the driving frequency (d), not the natural frequency (f0).
- Resonance: When the driving frequency approaches the natural frequency, energy builds up and oscillation amplitude increases dramatically. This can be desirable or undesirable (e.g., musical instruments vs. building in earthquakes).
Waves
- Mechanical Waves: Energy carried through a medium, requiring a medium to propagate.
- Continuous Waves: Anatomy: amplitude (A), wavelength (λ), wave speed (v), period (T), frequency (f), displacement (y(x,t))
- Simple Wave Equation: v = λ/T = fλ.
- Transverse Waves: Displacement is perpendicular to propagation (e.g., vibrating strings, electromagnetic waves).
- Longitudinal Waves: Displacement is parallel to propagation (e.g., sound waves).
- Wave Speed: Wave speed depends on the characteristics of the medium, e.g., tension for strings and density of the material. Transverse waves on a string have a non-dispersive speed.
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Surface Waves: Gravity-driven waves on waterbodies.
- In deep water: v = √(gλ/2π). Dispersive.
- In shallow water: v = √(gh). Dispersive; speed depends on depth and wavelength.
- Frequency and Amplitude: frequency (pitch) and amplitude (loudness) are related to the wave properties.
Principle of Superposition
- Waves passing each other: net displacement is the sum of individual displacements.
- Constructive interference: larger displacement.
- Partially destructive interference: smaller displacement.
- Completely destructive interference: zero displacement.
- Beats: Amplitude oscillation (beat) from overlapping waves of close frequencies (f1-f2).
Standing Waves (Normal Modes)
- Superimposition of reflected waves in a bound medium.
- Certain wavelengths produce constructive interference, resulting in fixed positions of maximum and zero displacement (standing waves).
- Nodes: Zero displacement.
- Antinodes: maximum displacement.
- Rules for strings/air columns: Fixed ends have nodes, open ends have antinodes; nodes and antinodes alternate evenly spaced.
- Fundamental Mode: Fewest nodes and antinodes. Successive overtones have more than the previous.
- Numbering Harmonics: Frequencies of normal modes: fn = n * f1 (n = harmonic number), f1=fundamental mode.
Open-Open Pipes (Standing Waves)
- Rules similar to strings/air columns
Doppler Effect
- Observed frequency (fL) can differ from emitted frequency (fS) when source (S) and/or observer (L) are moving.
- Formula: fL = (vw + vL) / (vw + vS) fS (vw is speed of wave, vL is velocity of observer, vS is velocity of source).
- Radial Velocity: Only radial velocity (along line of sight) affects the Doppler shift.
Shock Fronts
- If source speed exceeds wave speed, a cone-shaped shock front forms.
- Mach Number (M): Ratio of source speed to wave speed.
Temperature and Heat
- Temperature: Measure of microscopic kinetic energy of particles; related to average speed of particles.
- Temperature Scales: Celsius, Kelvin (Celsius + 273.15), Absolute zero.
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Thermal Expansion: Materials expand with increasing temperature (nearly all).
- Linear Thermal Expansion: ΔL = αL0ΔT
- Volume Thermal Expansion: ΔV = βV0ΔT (β = coefficient of volume expansion)
- Gases: Ideal Gas Law (P1V1/T1 = P2V2/T2)
- Heat (Q): Amount of thermal energy transferred.
- Units: 1 calorie (cal) = 4184 J; 1 dietary calorie = 1000 cal; 1 Btu = 1055 J.
- Specific Heat Capacity: Q = mcΔT (heat = mass × specific heat × temperature change)
Thermal Equilibrium & Heat Transport
- Thermal Equilibrium: When two objects at different temperatures are in contact, heat flows from hotter to colder until they reach the same temperature.
- Zeroth Law of Thermodynamics: If A = B, and B = C, then A = C.
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Heat Transport:
- Conduction: Heat transfer via particle collisions (solids, liquids, gases). Speed depends on thermal conductivity.
- Convection: Heat transfer via fluid motion (liquids, gases). Speed depends on viscosity and density.
- Radiation: Heat transfer via electromagnetic waves (all substances). Speed is very fast.
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Description
Test your understanding of mass on a spring dynamics, including Hooke's Law and the principles of potential and kinetic energy. Dive into concepts like total mechanical energy and natural frequency, and see how they relate to oscillatory motion. Perfect for students studying physics topics on springs and oscillations.