# اسلاید پاورپوینت: قوه (force) ، مقصود (object) و اصطکاک (friction)…

### عناوین اصلی استخراج شده از این فایل پاورپوینت

● Physics 111: Mechanics Lecture 5
● Applications of Newton’s Laws
● Newton’s Laws
● Forces
● Gravitational Force: mg
● Normal Force: N
● Tension Force: T
● Forces of Friction: f
● Forces of Friction: Magnitude
● Static Friction
● Kinetic Friction
● Explore Forces of Friction
● Hints for Problem-Solving
● Objects in Equilibrium
● Equilibrium, Example 1
● Accelerating Objects
● Inclined Plane
● Multiple Objects
● Uniform Circular Motion
● Centripetal Force
● What provides Centripetal Force ?
● Problem Solving Strategy
● The Conical Pendulum
● Level Curves
● Banked Curves

 نوع زبان : انگلیسی حجم : ۲٫۰۶ مگا بایت نوع فایل : اسلاید پاورپوینت تعداد اسلایدها: ۳۴ صفحه زمان استخراج مطلب : ۲۰۱۸/۱۱/۰۲ ۰۷:۴۰:۲۱ پسوند فایل : ppt

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physics ۱۱۱ mechanics lecture ۵ dale gary njit physics department applications of newton’s laws newton’s first law newton’s second law newton’s third law frictional forces applications of newton’s laws circular motion isaac newton’s work represents one of the greatest contributions to science ever made by an individual. newton’s laws if no net force acts on a body then the body’s velocity cannot change. the net force on a body is equal to the product of the body’s mass and acceleration. when two bodies interact the force on the bodies from each other are always equal in magnitude and opposite in direction. force is a vector unit of force in s.i. forces the measure of interaction between two objects vector quantity has magnitude and direction may be a contact force or a field force particular forces gravitational force friction force tension force normal force spring force gravitational force mg gravitational force is a vector the magnitude of the gravitational force acting on an object of mass m near the earth’s surface is called the weight w of the object w mg direction vertically downward m mass g ۹.۸ m s۲ normal force n force from a solid surface which keeps object from falling through direction always perpendicular to the surface magnitude not necessary to be mg tension force t a taut rope exerts forces on whatever holds its ends direction always along the cord rope cable string …… and away from the object magnitude depend on situation t۱ t۲ t۱ t t۲ when an object is in motion on a surface or through a viscous medium there will be a resistance to the motion. this resistance is called the force of friction this is due to the interactions between the object and its environment we will be concerned with two types of frictional force force of static friction fs force of kinetic friction fk direction opposite the direction of the intended motion if moving in direction opposite the velocity if stationary in direction of the vector sum of other forces forces of friction f magnitude friction is proportional to the normal force static friction ff f  μsn kinetic friction ff μkn μ is the coefficient of friction the coefficients of friction are nearly independent of the area of contact why forces of friction magnitude static friction static friction acts to keep the object from moving if increases so does if decreases so does ƒs  µs n remember the equality holds when the surfaces are on the verge of slipping kinetic friction the force of kinetic friction acts when the object is in motion although µk can vary with speed we shall neglect any such variations ƒk µk n explore forces of friction vary the applied force note the value of the frictional force compare the values note what happens when the can starts to move hints for problem solving read the problem carefully at least once draw a picture of the system identify the object of primary interest and indicate forces with arrows label each force in the picture in a way that will bring to mind what physical quantity the label stands for e.g. t for tension draw a free body diagram of the object of interest based on the labeled picture. if additional objects are involved draw separate free body diagram for them choose a convenient coordinate system for each object apply newton’s second law. the x and y components of newton second law should be taken from the vector equation and written individually. this often results in two equations and two unknowns solve for the desired unknown quantity and substitute the numbers objects in equilibrium objects that are either at rest or moving with constant velocity are said to be in equilibrium acceleration of an object can be modeled as zero mathematically the net force acting on the object is zero equivalent to the set of component equations given by what is the smallest value of the force f such that the ۲. kg block will not slide down the wall the coefficient of static friction between the block and the wall is .۲. equilibrium example ۱ f accelerating objects if an object that can be modeled as a particle experiences an acceleration there must be a nonzero net force acting on it draw a free body diagram apply newton’s second law in component form inclined plane suppose a block with a mass of ۲.۵ kg is resting on a ramp. if the coefficient of static friction between the block and ramp is .۳۵ what maximum angle can the ramp make with the horizontal before the block starts to slip down newton ۲nd law then so inclined plane multiple objects a block of mass m۱ on a rough horizontal surface is connected to a ball of mass m۲ by a lightweight cord over a lightweight frictionless pulley as shown in figure. a force of magnitude f at an angle θ with the horizontal is applied to the block as shown and the block slides to the right. the coefficient of kinetic friction between the block and surface is μk. find the magnitude of acceleration of the two objects. multiple objects m۱ m۲ uniform circular motion constant speed or constant magnitude of velocity motion along a circle changing direction of velocity uniform circular motion definition uniform circular motion observations object moving along a curved path with constant speed magnitude of velocity same direction of velocity changing velocity changing acceleration is not zero net force acting on an object is not zero centripetal force magnitude direction centripetal uniform circular motion o x y ri r a b vi rf vf δr vi vf δv vf vi uniform circular motion velocity magnitude constant v the direction of the velocity is tangent to the circle acceleration magnitude directed toward the center of the circle of motion period time interval required for one …

### کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: قوه (force), مقصود (object), اصطکاک (friction), سو (direction), تحرک (motion), نیوتن (newton), حقوق (law), مسدود کردن (block),

این فایل پاورپوینت شامل ۳۴  اسلاید و به زبان انگلیسی و حجم آن ۲٫۰۶ مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ ۲۰۱۸/۱۱/۰۲ ۰۷:۴۰:۲۱ استخراج شده است.

https://web.njit.edu/~gary/111/assets/Phys111_lecture05.ppt

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