Examius
🇮🇳 COMEDK UGET · flashcards
COMEDK UGET Physics - Mechanics and Thermal Physics Flashcards
52 question-and-answer cards covering Physics - Mechanics and Thermal Physics as it is examined in COMEDK UGET. 24 of them are printed below, taken from across the deck — no signup, no paywall on the preview.
24 sample cards from the Physics - Mechanics and Thermal Physics deck
Sampled from the end of the deck, so these are different cards from the ones shown on the syllabus page.
State the parallel axis theorem.
I = I(cm) + Md^2: the moment of inertia about any axis equals the moment of inertia about a parallel axis through the centre of mass plus M times the square of the distance d between the axes.
Write the rotational kinetic energy and the rotational analogue of linear momentum.
Rotational KE = (1/2)Iω^2. Angular momentum L = Iω is the rotational analogue of linear momentum p = mv.
State Newton's law of universal gravitation.
Every two point masses attract each other with a force F = G m1 m2 / r^2, directed along the line joining them, where G ≈ 6.67×10^-11 N·m^2/kg^2 is the universal gravitational constant.
How does acceleration due to gravity g vary with height h above Earth's surface (h small)?
g' = g (1 − 2h/R) approximately, so g decreases with height; R is Earth's radius. (Exact: g' = g R^2 / (R+h)^2.)
Give the formulas for orbital velocity and escape velocity near Earth's surface.
Orbital velocity v(o) = √(GM/r) = √(gR) for a low orbit. Escape velocity v(e) = √(2GM/R) = √(2gR) ≈ 11.2 km/s for Earth.
State Kepler's three laws of planetary motion.
1) Each planet moves in an ellipse with the Sun at one focus. 2) The line joining planet and Sun sweeps equal areas in equal times (constant areal velocity). 3) The square of the orbital period is proportional to the cube of the semi-major axis: T^2 ∝ a^3.
Define stress and strain.
Stress = restoring force per unit area (F/A), unit N/m^2 or pascal. Strain = ratio of change in dimension to original dimension (dimensionless), e.g. ΔL/L.
State Hooke's law and define Young's modulus.
Hooke's law: within the elastic limit, stress is proportional to strain. Young's modulus Y = longitudinal stress / longitudinal strain = (F/A)/(ΔL/L).
What are the elastic limit and the yield point on a stress-strain curve?
The elastic limit is the maximum stress up to which the body returns to its original shape on removing the load. The yield point is the stress beyond which strain increases rapidly with little extra stress (permanent/plastic deformation begins).
State Pascal's law and give one application.
Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid and the walls of the container. Application: hydraulic lift/brakes, where a small force produces a large force.
State Archimedes' principle.
A body wholly or partly immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced by the body.
State the equation of continuity for fluid flow and what it expresses.
A1 v1 = A2 v2 (Av = constant). It expresses conservation of mass for an incompressible fluid: the volume flow rate is constant, so fluid moves faster where the pipe is narrower.
State Bernoulli's principle (equation) for streamline flow.
P + (1/2)ρv^2 + ρgh = constant along a streamline. It expresses conservation of energy per unit volume: where speed is high, pressure is low.
Define surface tension and viscosity.
Surface tension is the force per unit length acting along the surface of a liquid (or surface energy per unit area), due to cohesive forces. Viscosity is the internal friction opposing relative motion between fluid layers.
What is the difference between heat and temperature?
Heat is energy transferred between bodies due to a temperature difference (measured in joules). Temperature is a measure of the average kinetic energy of the molecules / the degree of hotness (measured in K, °C).
Give the conversion between Celsius, Fahrenheit, and Kelvin scales.
K = °C + 273.15; °F = (9/5)°C + 32; and °C = (5/9)(°F − 32).
Distinguish conduction, convection, and radiation.
Conduction: heat transfer through a medium by molecular collisions without bulk movement (solids). Convection: transfer by actual movement of heated fluid. Radiation: transfer by electromagnetic waves, requiring no medium.
State the formula for heat absorbed and define specific heat capacity and latent heat.
Q = mcΔT for temperature change, where c is specific heat (heat to raise 1 kg by 1 K). During a phase change, Q = mL, where L is latent heat (heat per unit mass to change state at constant temperature).
State the first law of thermodynamics.
ΔU = Q − W: the change in internal energy of a system equals the heat added to it minus the work done by the system. It is the law of conservation of energy applied to heat.
Compare isothermal and adiabatic processes.
Isothermal: temperature constant (ΔU=0, so Q=W), obeys PV = constant. Adiabatic: no heat exchange (Q=0, so ΔU = −W), obeys PV^γ = constant, where γ = Cp/Cv.
State the postulates and key result of the kinetic theory of gases for pressure.
Gas molecules are tiny, in constant random motion, collide elastically, and intermolecular forces are negligible. Pressure P = (1/3)(m N / V) v(rms)^2 = (1/3)ρ v(rms)^2; average translational KE per molecule = (3/2)kT.
Define simple harmonic motion and give its defining equation.
SHM is oscillatory motion in which the restoring force (or acceleration) is directly proportional to displacement and directed toward the mean position: a = −ω^2 x. Time period T = 2π/ω.
Give the time period of a simple pendulum and of a mass-spring system.
Simple pendulum: T = 2π√(L/g). Mass-spring: T = 2π√(m/k), where L is length, g gravity, m mass, k spring constant.
Write the relation between wave speed, frequency, and wavelength, and the condition for resonance/beats.
Wave speed v = f λ (frequency × wavelength). Beats occur when two waves of slightly different frequencies superpose; beat frequency = |f1 − f2|. Resonance occurs when driving frequency equals the natural frequency, giving maximum amplitude.
What this deck covers
The Physics - Mechanics and Thermal Physics deck follows the COMEDK UGET Physics - Mechanics and Thermal Physics syllabus — 5 chapters and 15 topics — so questions land on material that is genuinely examinable rather than trivia around it. That works out to roughly 10.4 cards per chapter.
Answers are written to be recallable, not just readable — averaging about 174 characters, which is long enough to carry the reasoning and short enough to say out loud.
A deck like this earns its keep on the second and third pass. Read the syllabus first so you know the shape of the subject, then use the cards to find the specific facts that have not stuck.
Physics - Mechanics and Thermal Physics flashcards FAQ
How many Physics - Mechanics and Thermal Physics flashcards are in this COMEDK UGET deck?
52 cards. This page previews 24 of them, sampled evenly across the deck so you can judge the difficulty before installing anything.
Are these COMEDK UGET flashcards free?
Yes. The preview here is free to read with no signup, and the full 52-card deck is free inside the Examius app.
What do the Physics - Mechanics and Thermal Physics cards cover?
They follow the COMEDK UGET Physics - Mechanics and Thermal Physics syllabus — 5 chapters and 15 topics — so the questions track what is actually examinable.
How should I use these flashcards?
Read the syllabus first so you know the shape of the subject, then drill the deck. Examius schedules each card with spaced repetition, so cards you keep missing come back sooner and ones you know drift further apart.