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H to show hint; Which formula is needed to find the force down this inclined plane? Force parallel to the plane or the Vertical component of force, which is (W sin degrees) Which formula is need to find the force into the plane? Force perpendicular to the plane or Horizontal component of force, which is (W cos degrees) Which formula is needed to find the normal force of the object on this plane? Horizontal component of force or (W cos degrees) The arrow shows the weight of the object. If you divide the force down the plane by the force into the plane, you'll get.... which is the coefficient of friction. It's Ff / Fn. If this object slides down the plane at constant velocity, then the tangent of the angle of incline is the.... or coefficient of sliding or kinetic friction An object weighs 102 N. What formula will find its mass? W = m g You find that an object fell a distance of 10 m. Which formula finds the time it took to fall? Use g = 9.8 m/s^2 for a An object is hurled up and out in a curved trajectory. Which formula finds how long it was airborne?  Which formula lets you calculate horizontal component of velocity of a projectile?  Which formula lets you calculate vertical component of velocity of a projectile? An object is moving horizontally at 5 m/s in a given time period. Which formula gives how far it went (or range)? or v = d / t You want to find out how high a projectile went up into the air. Which formula do you use?  You have a velocity-time graph. Which operation will give you acceleration? Slope (y / x) of any of the segments gives m/s^2. You have a velocity-time graph. Which operation gives you displacement for a particular time frame? Area (y times x) under the curve, which is actually the area between the line and the x-axis. Negative area would be negative displacement. You have 2 opposing unbalance forces. Which formula will give you a net force? With a net force, which formula will tell you how much the object can be accelerated, given the mass? Suppose an opposing force is friction. You know how much force it takes to pull it at constant velocity. Which formula give you a unit-less number indicating "roughness"? You have a projectile fired upward at 15 degrees, which formula will give you the horizontal velocity only?  A sled is being pulled with a force at an angle. What formula gives you the horizontal force that's pulling it? Given Force x cosine of the angle This sled has a weight. What must be subtracted from that weight to get the normal force? Vertical component of the pulling force.That's Given force x sine of the angle. You have determined how many times an object at the end of a string will rotate in 1 second. What formula lets you find how long it takes to rotate once? T = 1 / f[Period of Time is the converse of frequency.] You are using Snell's law to determine the critical angle going from water to air. What angle should the "angle of refraction" be set at to do this? 90 degrees Which formula would you use to find the force of attraction between 2 objects based on just masses & distance between them? Which formula would you use to find the electrical force of attraction between 2 charges separated by a distance? Where do you find the Universal Gravitation Constant, Coulomb's Constant, speed of light, speed of sound, & indices of refraction? Reference page that is provided to you Which formula has a constant that tells you how far a spring will be extended with each unit of force attached to it? F = -k d Which formula will tell you how much energy a spring will have if it is squished or stretched a certain length? Which formula will give you the velocity of light in a transparent substance, if you know the substance's index of refraction? Light moves from medium #1 to #2. One index of refraction & angles with the normal are known. What formula is involved? Snell's Law A rollercoaster car is stopped at the top of a hill. To determine how much energy of position it has, which formula would you use? PEgravitational = m g h (which is same as W h) What formula tells you how much energy a car coasting at 30 m/s has? A object starts moving from a standstill and gets up to a final velocity after traveling a distance. What formula will give you its acceleration? A object starts moving from a standstill and gets up to a final velocity after traveling for a time. What formula will give you its displacement during that time? If you know two velocities for an object, how can you get an average velocity? If you know total distance traveled and total time traveled, which formula give you average velocity? You are horizontally spinning a mass from the end of a string of a certain radius above your head. Which formula allows you to find the force your hand is pulling inward on the mass? You are horizontally spinning a mass from the end of a string of a certain radius above your head. Which formula allows you to find the inwardly-directed acceleration provided by your hand? What formula do you use to find the force exerted on an object if you know a change in velocity, the mass, and the time of interaction? If you wanted to calculate the momentum of an object, you would use which formula? p = m v If you wanted to find the change in momentum, aka impulse, which formula would you use Don't confuse this J with joules, an energy unit. NC uses J to represent impulse on its reference pages. What formula would you use to determine the velocity of two objects that collide & stick together, AFTER collision? You need to know masses & starting velocities. If you have a starting velocity of +13 m/s (which is east) and an ending velocity of -20 m/s (which is west), what is the change in velocity? Vf - Vi = -33 m/s How would you set up a certain formula to determine the effective resistance if you have 2 ohm, 3 ohm, & 4 ohm resistors wired together in parallel? How would you set up a certain formula to determine the effective resistance if you have 2 ohm, 3 ohm, & 4 ohm resistors wired together in series? Req = 2 + 3 + 4 If you knew the voltage & resistance in an electrical circuit, what formula would you use to determine the current? I = V / R [Also listed as V = I R or R = V / I] If you knew how many watts a hair dryer used and the voltage of the source, then you could determine the current using which formula? P = V I If you wanted to determine the electricity loss or waste in an electric circuit, you would use which power formula? 