The MDCAT 2025 Physics syllabus, outlined by the PMDC, covers core principles essential for understanding physical phenomena in medical contexts. With 54 MCQs dedicated to Physics (30% of the exam), focusing on conceptual mastery is key to scoring high. This guide delivers short, focused explanations of each topic to enhance your understanding and efficiency in preparation using MdSkool's tools.
Approach these concepts with curiosity, as they underpin real-world applications in medicine like imaging and biomechanics.
1. Vectors and Equilibrium
Vectors represent quantities with magnitude and direction; equilibrium occurs when net force/torque is zero.
- Addition of Vectors: Use rectangular components (x,y) for head-to-tail or parallelogram method.
- Scalar Product: Dot product = ab cosθ; measures work or projection.
- Vector Product: Cross product = ab sinθ; perpendicular vector, for torque or magnetic force.
Pro Tip
Resolve vectors into components early in problems—it simplifies calculations for forces in equilibrium.
2. Force and Motion
Motion describes object displacement; forces cause acceleration per Newton's laws.
- Displacement and Velocity: Displacement as vector; average velocity = displacement/time.
- Displacement-Time Graphs: Slope gives velocity; curve indicates acceleration.
- Acceleration: Uniform (constant) vs. variable (changing); a = dv/dt.
- Projectile Motion: 2D motion under gravity; horizontal constant velocity, vertical accelerated.
- Components: vx = v cosθ, vy = v sinθ - gt.
- Max Height, Range, Time: H = (v sinθ)^2 / 2g; R = v^2 sin2θ / g; T = 2v sinθ / g; max R at 45°.
- Newton's Laws: Inertia, F=ma, action-reaction.
- Momentum: p = mv; conserved in closed systems.
- Collisions: Elastic (KE conserved), inelastic (KE lost); one-dimensional calculations.
- Perfectly Elastic: Relative speed of approach = separation.
3. Work and Energy
Energy is capacity for work; conserved in transformations.
- Work: W = F · d = Fd cosθ.
- Kinetic Energy: KE = 1/2 mv^2.
- Potential Energy: PE = mgh; relative to reference.
- Power: P = F · v; rate of work.
- Work-Energy Theorem: Work done = ΔKE; in friction, heat loss.
- Efficiency: Useful output / input; energy losses in devices.
Study Tip
Apply conservation of energy to simplify projectile or collision problems—bypasses force details.
4. Rotational and Circular Motion
Rotation involves angular quantities analogous to linear motion.
- Angular Displacement: θ in radians (2π rad = 360°).
- Angular Velocity: ω = dθ/dt.
- Linear-Angular Relations: s = rθ, v = rω, a = rα.
5. Fluid Dynamics
Fluids flow under pressure differences; ideal flow assumes no viscosity.
- Terminal Velocity: Balance of drag and weight.
- Fluid Drag: Opposes motion; increases with speed.
- Flow Types: Steady (constant velocity), incompressible (density constant), laminar (smooth), turbulent (chaotic).
- Equation of Continuity: A1v1 = A2v2; mass conservation.
- Bernoulli’s Equation: P + 1/2 ρv^2 + ρgh = constant; explains pressure drops in flow, applications in blood vessels.
6. Waves
Waves transfer energy without matter transport.
- Wave Motion: Vibrations propagate in medium like ropes.
- Progressive Waves: Travel with amplitude, period T, wavelength λ, speed v = fλ.
- Transverse vs. Longitudinal: Perpendicular (light) vs. parallel (sound) to direction.
- Speed of Sound: Newton: v = √(P/ρ); Laplace correction with γ (adiabatic).
- Factors: Increases with temperature, density effects.
- Superposition: From coherent sources; interference constructive/destructive.
- Stationary Waves: Nodes (zero amp), antinodes (max); in strings/pipes.
- SHM: Restoring force proportional to displacement; projection of circular motion.
7. Thermodynamics
Heat and energy transfer in systems.
- Thermal Equilibrium: Equal temperature; heat flows hot to cold.
- Specific Heat: Heat per unit mass per degree; molar for moles.
- Work in Gases: PdV for volume change.
- First Law: ΔU = Q + W; internal energy conserved.
- Cp - Cv = R: For ideal gas; Cp > Cv.
8. Electrostatics
Charges at rest produce electric fields.
- Coulomb’s Law: F = k q1 q2 / r^2; k = 1/(4πε0), medium reduces by εr.
- Electric Field: E = F/q; for point charge E = kq/r^2; infinite sheet E = σ/(2ε0).
- Field Lines: From + to -; dense where strong.
- Potential: V = W/q; energy = qV.
- Capacitor Charging: Through resistor; time constant RC.
9. Current Electricity
Flow of charges in circuits.
- Steady Current: Constant flow.
- Ohm’s Law: V = IR.
- Resistance: R = ρL/A; temperature coefficient α.
- Internal Resistance: Of battery; affects output.
- Max Power: When load = internal resistance.
10. Electromagnetism
Magnetic fields from currents or moving charges.
- Magnetic Flux Density: B in tesla.
- Flux: Φ = B · A.
- Charged Particle in B: F = qvB sinθ; circular path if perpendicular.
11. Electromagnetic Induction
Changing flux induces emf.
- Faraday’s Law: emf = -dΦ/dt.
- Lenz’s Law: Induced current opposes change; conserves energy.
- Transformer: Mutual induction; turns ratio for voltage step-up/down.
12. Alternating Current
Oscillating current/voltage.
- Phase: Lag/lead in circuits.
- AC in Components: Resistor (in phase), capacitor (current leads), inductor (current lags).
- EM Waves: Spectrum from radio to gamma; transverse E and B fields.
13. Electronics
Semiconductor devices for control.
- Rectification: Diodes convert AC to DC; half/full wave.
- PN Junction: Forward (low R), reverse (high R) bias.
14. Dawn of Modern Physics
Quantum mechanics introduction.
- Quantum Theory: Light as photons; E = hf.
15. Atomic Spectra
Electron transitions emit/absorb light.
- Line Spectra: Discrete wavelengths from energy levels.
16. Nuclear Physics
Nucleus structure and reactions.
- Nuclei Composition: Protons + neutrons; electrons outside.
- Decay: Spontaneous, random; alpha, beta, gamma.
- Half-Life: Time for half decay; rate λ = 0.693 / T1/2.
- Medical Uses: Radiation in imaging, therapy; biological effects.
With a clear grasp of the MDCAT Physics syllabus, you're equipped to tackle the exam head-on. Utilize MdSkool's AI tutor MIRA for practice questions and explanations to solidify these concepts. Stay dedicated—your future in medicine awaits!
