AP Physics C: Mechanics Friction, Drag, and Elasticity — practice questions
49 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice AP Physics C: Mechanics Friction, Drag, and Elasticity in the app →Which of these matches how the source defines friction?Two surfaces are in contact and sliding past one another right now. What is the friction between them called?For the same pair of surfaces, how does the maximum value of static friction usually compare with the kinetic A crate is not moving even though you are pushing on it as hard as you can without success. What does the ineqOnce a crate is already sliding across the floor, how does the friction force acting on it behave if you keep According to the atomic-scale discussion of friction, how does the visible contact area between two surfaces aAt the atomic scale, why do two surfaces get measurably warmer after being rubbed together?Why does the source describe the friction coefficients in its table as only an approximate description of fricHow does the coefficient of friction in a healthy human joint compare with the coefficient of friction of ice A 100 kg crate rests on a concrete floor where the coefficient of static friction is 0.45. Using g = 9.80 m/s The same 100 kg crate from the previous problem is now sliding, where the coefficient of kinetic friction is 0A 62 kg skier slides down a 25 degree slope, and the kinetic friction on the skier is measured to be 45.0 N. UIn a take-home experiment, a coin is placed on a textbook that is then tilted until the coin slides down at a An object is sliding down an incline at a constant velocity. What must be true about the net force acting on iOnce a heavy crate is finally set into motion after a hard push, why does it become easier to keep sliding thaAccording to the source, the coefficient of friction between two surfaces is best described as which of these?For a large object such as a car or a baseball moving through air at ordinary speeds, how does the magnitude oWhat kind of quantity is the drag coefficient C used in the drag force equation?At typical highway speeds, roughly what share of a car's engine power goes toward overcoming air drag?According to the source, what is the approximate most fuel-efficient cruising speed range for a typical car?During the 1970s oil crisis in the United States, to what speed were maximum highway speeds set, according to A skydiver falling through the air reaches a point where the drag force equals the force of gravity on them. WComparing two skydivers with the same drag coefficient and frontal area, why must a heavier skydiver reach a hA 75 kg skydiver falls head first, minimizing frontal area and drag. What terminal velocity does the source reThe same skydiver instead falls in a spread eagle position, increasing frontal area. What does the source say An 85 kg skydiver falls spread eagle with an estimated frontal area of 0.70 square meters, a drag coefficient Stokes' law applies to very small, slow-moving objects in a dense fluid, such as bacteria settling in water. HSediment deposited on the surface of a lake settles toward the bottom at its terminal velocity under Stokes' lA small squirrel falls from a 5 meter tree branch and walks away unhurt, while a human falling the same heightA quotation from J.B.S. Haldane's essay describes dividing an animal's length, breadth, and height each by tenFish, dolphins, whales, and flying birds all share a certain body shape that the source connects to reducing dIn the source's discussion of elasticity, what is a deformation?For a small deformation, what happens to an object's shape once the deforming force is removed, according to tFor small deformations, how does the size of the deformation relate to the applied force, according to Hooke'sWhat does the source define as tensile strength?Deformation can be classified into three specific types covered together. Which of the following is NOT one ofA suspension cable is made of steel with Young's modulus 210 times ten to the ninth newtons per square meter, A 70.0 kg man supports 62.0 kg of his weight on one leg, modeled as a uniform rod 40.0 cm long and 2.00 cm in The source rewrites the change-in-length equation as stress equals Young's modulus times strain. What relationComparing bone with most other structural materials, what unusual relationship does the source describe betweeHow does concrete used in building pillars and arches behave under compression compared with under shear, accoWhat does the source say about the shear moduli of liquids and gases?It is relatively easy to compress a gas but extremely difficult to compress a liquid or a solid. What reason dAt a depth of 5.00 km in the ocean, the force per unit area on seawater is 5.00 times ten to the seventh newtoUnlike most materials, what unusual behavior does water show when it freezes, according to the source?What example does the source give of a practical application of bulk compression on solids?A human tendon shows a nonlinear stress-strain curve. What does the source call the very first part of that stIf human arteries were rigid instead of elastic, what would you notice about your pulse, according to the sourAccording to the source, at roughly what point in life does the gradual physiological reduction in the body's