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OAT Physics REVIEW
Length si units correct answer Meters (m) Mass si unit scorrect answer Physics- kilogram (kg) chemistry- gram (g) Volume si unit scorrect answer Physics -meters cubed (m^3 (=1000L) ) Chemistry - Liters (L) Si unit Force correct answer Newton (N) which is kg·m / s^2 because it is mass times acceleration Si unit time correct answer Seconds (s) Si unit Current correct answer Ampere (Amp) Si unit temperature correct answer Kelvin (K) Luminosity correct answer Candella (Cd) si unit for energy and work correct answer Joules (J) which is N·m or kg·m^2/ s^ Work formula correct answer Force times displacement W= xFcos theta Kinetic.energy formul acorrect answer KE= 1/2 mv^ (think about the units kg· (m/s)^2. )
Potential energy correct answer PE= mgh So kg ·m/s^2 · m Power formulacorrect answer P= w/change in time (W) Wattscorrect answer J/s or Nm/s or kg·m^2/s^ Velocity formulacorrect answer change in displacement/ change in time (m/s) Acceleration formulacorrect answer change in velocity/ change in time (m/s^2) Definition of displacementcorrect answer Vector- The difference from where you started to where you ended in a straight line path (d, change in x/t, change in y/t) Definition of distancecorrect answer scalar- how far something moved in total Forcecorrect answer F= ma Densitycorrect answer italicized p = m/V (kg/m^3) Pressure (Pascal)correct answer P= F/Area Pa= N/m^2= kg/m x s^ P= density of fluid x g x D Pa= (kg/m^3)(m/s^2)m = kg/m x s^ sin 90correct answer 1. sin 60correct answer 0. sin 45correct answer 0.
Kinematic equation when missing final velocitycorrect answer d= initial velocity(t) + 1/2 at^ Acceleration can only be zero when.....correct answer object is going in straight line with no change in direction at a constant speed If the object's speed is constant while maneuvering a turn, is the acceleration = 0correct answer No, the magnitude is constant but the direction is changing which changes the velocity, thus the acceleration Distance between 2 pointscorrect answer d= square root of [ (x2 - x1)^2 + (y2- y1)^2] Projectile motion - steps to calculate time, apex or max height, and final displacement when given the initial velocity and angle of the velocitycorrect answer
- break velocity into x and y components Vx= Vinitial (cos theta) Vy= Vinitial (sin theta) use Vy to find t and max height and Vx to find final displacement time Vy in up direction will slow by approx 10m/s for every second. 1/2 t = how many seconds to take velocity to zero (velocity/ 10m/s) times this number by 2 to get total t for projectile motion max height=average velocity on way up (time to apex) d= Vx (total t) What information can be obtained from graph of displacement and timecorrect answer slope = change in displacement/ change in time = v
What information can be obtained from graph of velocity vs. timecorrect answer slope= change in velocity/ change in time = a area under the curve= displacement dont forget that the area of a triange = 1/2 bh Area of a trianglecorrect answer A= 1/2 bh On velocity vs time graph, if velocity and acceleration have opposite signs the object iscorrect answer slowing down On velocity vs. time graph, if velocity and acceleration have same signs the object iscorrect answer speeding up On velocity vs. time graph, if horizontal linecorrect answer velocity is constant, acceleration= On velocity vs. time graph, if line is a constant diagnalcorrect answer acceleration is constant on velocity vs. time graph, if Velocity is greater than zerocorrect answer object is moving forward on displacement vs. time graph, if horizontal linecorrect answer velocity= 0 and displacement is constant on displacement vs. time graph, constant diagonal linecorrect answer velocity is constant Weight formulacorrect answer W= mg weight is a force and therefore the units are N or ( kg x m/s^2 )
when object is beginning at rest kinetic frictioncorrect answer 2 objects sliding across each other If a man is on an elevator, where is the acceleration of the elevator a force upward and where downward? Will you feel lighter or heavier during each?correct answer When the elevator begins to move at the bottom, the acceleration points upward and the man in it feels heavier. Fnormal-mg= ma When the elevator goes to stop at the top, the acceleration points downwards and the man feels lighter. Fnormal-mg= -ma If an elevator question asks for man or objects "apparent weight" what are we solving for?correct answer Fnormal= m(g-a) acceleration down or Fnormal= m(g+a) acceleration up Incline Planes What is the component of mg opposing normal force?correct answer Fnormal= mgcostheta Incline Planes What component of mg is adding force down the incline plane?correct answer mg sin theta Sum of Forces on an axis always equals what?correct answer ma What is the acceleration when velocity is constantcorrect answer a=o What is the formula for centripetal accelerationcorrect answer a(centripetal)= v^2/r (acceleration is always towards the center of the circle)
What is the centripetal forcecorrect answer F= m x a(centripetal)= mv^2/r Work formulacorrect answer W=F d only the force in the same direction as displacement Mechanical Energy Formulacorrect answer ME(total)= PE + KE ME= mgh + 1/2mv^ Translational Kinetic Energy Formulacorrect answer KE (trans) = 1/2 mv^ Potential Energy formulacorrect answer PE= mgh Example of nonconservative forcescorrect answer friction, air resistance Conservation of Mechanical Energy (all energy conserved)correct answer 1/2mv^ (initial) + mgh(initial)= 1/2mv^2(final)+ mgh(final) Work Done by non-conserved forces (usually friction or air resistance)correct answer Wnc= Energy(final)- Energy (initial) Work Energy Theoremcorrect answer W= KE(final) - KE (total) Power formulacorrect answer P= W/change in time [Watts which equal (kg m^2/s^3 ) ] Momentum formuulacorrect answer italicized p= mv What is Impulse and what is the formulacorrect answer An impulse is a change in momentum (delta mv)
In terms of inertia which is easier to rotate and object with mass concentrated towards the center or outside perimetercorrect answer towards the center (smaller Inertia) Angular Momentum formulacorrect answer L= Iw (omega) Rotational Kinetic Energy formulacorrect answer 1/2 I w^ Analogous pairs between translational and rotationalcorrect answer d= change in theta v= w(omega) a= alpha m= I (inertia) p(momentum) = L F= T (tortque) Kinematic equation when initial velocity is missingcorrect answer d= Vf t - 1/2at^ Kinematic equation when missing acorrect answer D= 1/2 (Vi+Vf)t During projectile motion the horizontal component of velocity is.....correct answer Constant what are the units of torquecorrect answer Nm (with torque we don't call them joules we just call them Newton meters) density formulacorrect answer p (ro)= m/V Density of water (for physics)correct answer pH2O= 1000kg/m^ specific gravity formulacorrect answer SpG= p/pH2O
describes density compared to water Ex: something 10 x denser than water SG= something 3/4 as dense as water SG= 0. All pressure conversionscorrect answer 1 atm= 760 torr = 760 mm HG = 100, 000 Pa Pressure formulacorrect answer P= F/Area Gauge Pressure or hydrostatic pressure formulacorrect answer P= p(fluid) g D where D=depth Remember that Every 10m of depth in water is equal tocorrect answer 100000 Pa or 1 atm Total Pressure formulacorrect answer P(o) + pgD Refers to original pressure before you dove into the water plus what ever pressure occurred in liquid. If not given assume 1 atm air pressure Buoyancy Force formula (Archemedes Principle)correct answer Fb= W fluid displaced = p fluid x Vsubmerged x g What does the Fb equal if an object is floating?correct answer equal to the Objects weight (mg) and also the weight of the displaced liquid (pfluidVfluidg) Two boxes of equal weight are floating in the water. One is barely submerged and has most of its area above water. The second box is mostly submerged with only a small portion of its area above water. What can you say about the differences between these two boxes?correct answer While both have a weight that is = to the bouyancy force, the first box is much less dense that water. The second box is only slightly less dense than water.
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