 GAMSAT Physics Equation Lists (Formulas and Topics)
• Memorising GAMSAT physics equations does not replace understanding. Strong science reasoning may negate the need to memorise. However, the GAMSAT physics equations that we have listed can sometimes provide shortcuts when problem solving.
• alpha: α mu: μ delta: Δ
If you don't see the highlighted Greek symbols above then the physics equations or formulas below will not make sense; thus adjust fonts on your browser to Unicode. Besides the formulas on this page, we have also recently added a GAMSAT physics syllabus (topic list).
• Please note: ACER announced in 2011 that calculators will no longer be permitted for GAMSAT Section 3. For this reason, we have created a separate page with useful tips and formulas related to GAMSAT Physics and Section 3 in order to help you develop math skills: Free GAMSAT Maths Tips and Formulas.
• We have placed some GAMSAT Physics practice questions with worked solutions here: GAMSAT Physics Sample Questions

GAMSAT Physics Equation List (formulas) and practice problems in dimensional analysis

## Memorise These!

 Momentum, Impulse PHY 4.3 M = mv Energy (conservation) PHY 5.5 ET = Ek + Ep Work, Power PHY 5.7 P = ΔW/Δt Current PHY 10.1 I = Q/t Resistors (series, par.) PHY 10.2 Req = R1 + R2 . . . 1/ Req = 1/ R1 +1/ R2 . . . Capacitors (series, par.) PHY 10.4 1/ Ceq = 1/ C1 +1/ C2 . . . Ceq = C1 + C2 . . . Kirchoff's Laws PHY 10.3.1 Σi = 0 at a junction ΣΔV = 0 in a loop Torque forces PHY 4.1 L1 = F1× r1 (CCW + ve) L2 = F2 × r2 (CW -ve) Torque force at EQ PHY 4.1 ΣFx = 0 and ΣFy = 0 ΣL = 0 Force PHY 2.2 F = ma Weight PHY 2.1 W = mg Pressure PHY 6.1.2 P = F/A Buoyant Force PHY 6.1.1 ρ = mass / volume Fb= Vρg = mg Optics PHY 11.3 M = magnification = - i/o

## Memorise as Pairs

 F = KG ( m1 m2 / r2 ) PHY 2.4 and 9.1.2 F = k ( q1 q2 / r2 ) Intensity = power/area ∝ 1 / r2 PHY 8.3 V = IR PHY 10.1 and 10.5 P = IV Paired Use vav = Δ d / Δ t PHY. 1.4.1 aav = Δ v / Δ t (avg vel, acc) v = λ f PHY 7.1.2 and 9.2.4 E = hf (f = 1/T) Ek = 1/2 mv2 PHY 5.3-4 Ep = mgh (kin, pot E)

## We Suggest (can Save Time during Exam)

 Translational motion PHY 1.6 and 2.5 x = xo + vo t + 1/2at2    |    (Vf)2 = (Vo)2 + 2ax Vf = Vo + at Uniform circular motion PHY 3.3 Fc = mac = mv2 /r ac= v2 /r Work, Power PHY 5.1 and 5.7 W = F d cosθ P = ΔW/Δt Spring Force, Work PHY 7.2.1 F = -kx W = kx2 /2 Refraction PHY 7.2.1 (sin θ1 )/(sin θ2 ) = v1 /v2 = n2 /n1 = λ1 /λ2 n = c/v Pressure PHY 6.1.2 Δ Ρ = ρgΔh Atomic Physics PHY 12.4 If the number of half-lifes n are known we can calculate the percentage of a pure radioactive sample left after undergoing decay since the fraction remaining = (1/2)n

## Occasionally Helpful for Theoretical Questions

 Frictional force PHY 3.2 fmax = μN μk < μs always Momentum, Impulse PHY 4.3 I = F Δt = ΔM Electric Force PHY 9.1.2 F = qE Optics PHY 11.5 1/ i + 1/ o = 1/ f = 2/r = Power Specific Gravity PHY 6.1.1 SG = ρ substance / ρ water ρ = 1 g/cm3 = 103 kg/m3 (H2O) Note: Specific gravity (SG) is equivalent to the fraction of the height of a buoyant object below the surface of the fluid.

## Don't Memorise, Know How to Use...

 Fluids in Motion PHY 5.3-4 Bernouilli's Equation Ρ + ρgh + 1/2 ρv2 = constant Solids, Temp Δ PHY 5.3-4 Linear Expansion L = Lo (1 + αΔ T ) Area Expansion PHY 6.3 A = Ao(1 + γΔ T ) β = 3 α PHY 6.3 Volume Expansion V = Vo(1 + βΔ T ) Doppler Effect: when d is decreasing use + vo and - vs PHY 8.5.1 fo = fs (V ± vo )/( V ± vs ) d = the distance between the plates PHY 10.4 V = Ed for a parallel plate capacitor RH rule PHY 9.2.3 Laplace's Law dF = dq v(B sin α) = I dl(B sin α) W = 1/2 CV2 PHY 10.4 Work in Electricity Potential Energy ( PE ) = W = 1/2 QV ΔG° = -RTln Keq CHM 9.10 Gibbs Free Energy ΔG = ΔH - TΔS Continuity (fluids) PHY 6.1.3 A v = const. ρAv = const. Sound PHY8.3.1 -4 dB = 10 log 10 (I/I0 ) beats = Δ f Thermodynamics PHY 8.7 Q = mc Δ T Root Mean Sq PHY 10.5 Irms = Imax / √2 Energy (conservation) PHY 12.3 E = mc2

## The Basics sin θ = opp/hyp cos θ = adj/hyp tan θ =opp/adj θ = sin-1 x arcsec θ = sec-1θ r2 = x2 + y2 • Angle θ may be given in radians (R) where 1 revolution = 2πR = 360°
• Estimate square root 3 as 1.7 and root 2 as 1.4 (N.B. calculators are no longer permitted so these details may save you time in GAMSAT Physics or GAMSAT Chemistry).
• Cross-sectional area of a tube = area of a circle = πr2 where π can be estimated as 3.14 and r is the radius of the circle; circumference = 2πr.

Please note: ACER announced in 2011 that calculators will no longer be permitted for GAMSAT Section 3. Our updated list of GAMSAT Physics Topics can be found towards the bottom of this page.

## Some Units to Memorise

• Both work and energy are measured in joules where 1 joule (J) = 1 N × 1 m . {Imperial units: the foot-pound , CGS units: the dyne-centimeter or erg }
• The SI unit for power is the watt (W) which equals one joule per second (J/s) = volts × amperes .
• Current is measured in amperes = coulombs/sec. The units of resistance are ohms, symbolized by Ω (omega), where 1 ohm = 1 volt/ampere.
• The SI unit for pressure is the pascal (1 Pa = 1 N/m2 ). Other units are: 1.00 atm = 1.01 × 105 Pa = 1.01 bar = 760 mmHg = 760 torr.

## GAMSAT Physics Topics

The following GAMSAT Physics Topic list or syllabus is not meant to be exhaustive nor definitive. It is a guideline for topics that we cover for the GAMSAT preparation course during our live classes and in the videos that we have online or as DVDs.

TOPICS: The Atom, Nuclear Reactions, Radioactive Decay and Half-Life, Electricity vs. Gravity, Electric Circuits, Kirchhoff's Laws, Characteristics of Waves, Diffraction, Optics, Sound, Doppler Effect, Electromagnetism, Electromagnetic Spectrum, Reflection, Refraction, Thin Lens, Snell's Law, The Critical Angle, Force and Motion, Weight and Units, Friction, Applying Newton's Laws, Trigonometry, Projectile Motion, Work, Circular Motion, Work-Energy Theorem, Energy and Entropy, Momentum, Law of Torques, Fluids, Fluids in Motion, Archimedes' Principle 