Clipboard Font Paragraph Styles Grammar Styles Editing Experiment 5: Kinetic Friction The value of, is generally greater

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Clipboard Font Paragraph Styles Grammar Styles Editing Experiment 5 Kinetic Friction The Value Of Is Generally Greater 1 (108.9 KiB) Viewed 52 times

Clipboard Font Paragraph Styles Grammar Styles Editing Experiment 5: Kinetic Friction The value of, is generally greater than that of so the larger force is needed to start motion when compared to the kinetic friction case Graphically, this is shown in Fig 2. As you increase the force F, the static friction force increases inearly until the applied force Fequals to F. mar = Fy After this point the object breaks away" and the friction force falls to the kinetic friction value. AFriction force F, mas = HAFN F, = F Background There are two types of friction kinetic and static Kinetic friction is the friction between surfaces in relative motion when sliding an object across another surface, microscopic bumps and defects tend to impede and resist the motion (even the smoothestsurfaces are rough on the microscopic scale). This is the type of force that brings a sliding box to restor a coasting car to a stop. Experimentally, it is observed that the force of kinetic friction is proportional to the normal force acting between the surfaces if you increase the normal force, the surfaces are pressed together harder, making the contact between the surface bumps stronger, and thus increasing the frictional force Mathematically we can write the force of kinetic friction as Fr=uFN Fy where Fn is the normal force between the two surfaces in contact with one another and is the coefficient of kinetic friction Static friction describes the frictional forces between the surfaces of two objects that are at rest with respect to each other. When an external force F tries to move an object on the rough surface the static . F frictional force F, prevents the object from moving always being equal to the extemal force: FF When the force F increases the static frictional force Fincreases as well However, the static frictional force cannot exceed some maximum value Fmax This maximum force of static friction between the two surfaces is proportional to the normal force Femer = Fy where is the coefficient of static friction. Thus, the static frictional force Fris F. Su, Fy 0 0 0 Static region -- Fig2 Physics Simulations: Friction Lab http://www.thephysicsaviary.com/Physics ... Labs/Force Friction/index.html Type of Surfaces Object Mass Rubber on Ice 227 g Motion ca 0.00 N F = mg FN = mg F FR = HAFN F, = F ing mg (b) (a) Impending motion Start Object moves Fig. 1 BOB 170 931 AM 4/27/2022 51°F Sunny Words: 605 L Page: 1 of 5 C < о AH Type here to search