A fluid‑like substance called synovial fluid lubricates the surfaces where bones meet in joints, making the coefficient of static friction between bones very small. For simplicity, assume the surfaces in the knee are flat and horizontal.   Why is the minimum force required for initiating movement of bones in a typical knee joint different for different people, in spite of the fact that their joints have the same coefficient of static friction?

Q: If a box on a horizontal surface has an externally applied horizontal force that exceeds the value…

A: According to Newton's second law  F =ma

Q: A 4.00 kg block sits on a table top with a coefficient of static friction of 0.470 and a coefficient…

A: Given,

Q: A horizontal force F is applied at the top of an equilateral triangular block having · mass m and…

A: Given- A horizontal force F is applied at the top of an equilateral triangular block having mass m.…

Q: The two blocks (m= 16 kg and M = 88 kg) are not attached to each other.The coefficient of static…

A: Given: Mass m = 16 kg. Mass M = 88 kg. The friction coefficient between surface of blocks (µs) =…

Q: Determine the range of values for Mass B so that 250 kg Mass A in Figure Q2 is in equilibrium. The…

A:

Q: Traction is a medical procedure used to treat muscle and skeletal disorders by strategically…

A: Given The force applied in right is F = 55 N. The force applied on the left is F' = 40 N.…

Q: The forces acting on the sailplane are its weight W = -500j (lb.) , the drag D = -200i + 100j (lb.),…

A: W = -500 j^ lb D = -200 i^ +  100j^ lb Lift force = L

Q: What is the value of the of the frictional force based on the force applied? Assume the box starts…

A: The net force acting in the block is given by, Fnet=FA-Ff.............(1) Where. FA=force acting on…

Q: In the figure, a rectangular slab of slate rests on a bedrock surface inclined at angle θ = 28.2°.…

A: The figure is shown below:

Q: Is the coefficient of static friction the same for two surfaces regardless of the normal force? Why?

A: The coefficient of static friction depends on the objects that are causing the friction due to…

Q: A block of mass M is at rest on a plane inclined at an angle θ to the horizontal, as shown: If the…

A: From Newton's law Mgsinθ=μkMgcosθsinθ=μkcosθsinθcosθ=μktanθ=μkθ=tan-1μk  =tan-10.42…

Q: Two unknown materials have a coefficient of static friction of 1.3. Without any further information,…

A: The coefficient of static friction is always greater than the coefficient of kinetic fiction.…

Q: A Wall of Death is a carnival show featuring a motorcyclist rides along the vertical wall of the…

A: Given:- The radius of the cylinder is r = 7 m The static coefficient of the friction is μ= 0.8 a…

Q: On an alien planet, an object moving at 4.0 m/s on the horizontal ground comes to rest after…

A:

Q: The two blocks shown below have the mass of m1 = 4.0 kg and m2 = 1.0 kg. Determine the largest force…

A:

Q: "If the coefficient of kinetic friction between tires and pavement is 0.80, what is the shortest…

A:

Q: A body weighing 350 lb rest on a plane inclined 30 o with the horizontal as shown in Figure. The…

A:

Q: A conveyor is dumping sand onto a cone shaped pile. Given that the coefficient of static friction…

A:

Q: 3. A uniform 40.0 kg ladder of length 5.0 m is leaning against a frictionless wall, as shown below.…

A:

Q: A person pulls at an angle of 0 = 34.0° on three connected crates of masses m¡ = 25.0 kg, m2 = 18.0…

A: To determine,the value of pulling force(FP).given,m1=25 kgm2=18 kgm3=15 kgangle of pull from…

Q: The puck has a mass of 1.80 kg. Between the board and puck the coefficient of static friction is…

A: Given data:  Mass (m) = 1.80 kg Coefficient of static friction (μs) = 0.350 Coefficient of kinetic…

Q: Calculate the smallest radius of a curve that one can safely navigate at normal highway speeds (30…

A: Given data *The given speed is v = 30 m/s *The coefficient of static friction between the rubber and…

Q: Does the fact that the coefficient given is the static friction coefficient changes anything or you…

A: Given coefficient of friction is static, but problem is related to kinetic and static friction, both…

Q: What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her…

A:

Q: Given problem: Determine the smallest horizontal force ‘P’ required to lift the 246.68-kg crate.…

A:

Q: 270 N 50°7 B 400 N 30 D 30

A:

Q: 7. A 8.00 kg block is pressed against a vertical wall by a force (F), as shown in the figure below.…

A:

Q: What is the minimum downward force (F) on the box that will keep it from slipping? The coefficient…

A: Applied force = 125 N  Mass = 30 kg  Coefficient of kinetic friction = 0.25  Coefficient of static…

Q: 3. A 6.50 kg block is pressed against a vertical wall by a force (F), as shown in the figure below.…

A: The given force holds up the block against the wall. And since the wall is rough, it offers a…

Q: After emergencies with major blood loss, a patient is placed in the Trendelenburg position, in which…

A:

Q: A horizontal force of 800 N is needed to overcome the force of static friction between a level floor…

A: The magnitude of horizontal force F=800 N The mass of the crate m=200 kg The acceleration due to…

Q: A student wants to determine the coefficients of static friction and kinetic friction between a box…

A:

Q: Land Rover ads used to claim that their vehicles could climb a slope of 45°. For this to be…

A: Angle = 45 degree

Q: The maximum possible value for the coefficient of static friction is a. 0.50 b. 1.00 c. a value…

A: Coefficient of static friction is equal to the frictional force divided by the normal force.

Q: 3. The uniform crate has a mass of 150 kg. If the coefficient of static friction between the crate…

A: Given:mass of the crate, m=150 kgStatic friction coefficient between the crate and the floor,…

Q: 5. A 7.6 kg object is at rest on an inclined plane. If the inclined plane makes an angle with the…

A:

Q: At what maximum speed can a car exit onto a 40-m-radius circular freeway ramp without sliding if the…

A: Given data: Radius (r) = 40 m Coefficient of static friction (μs) = 0.90 Required: Maximum speed (v)…

Q: A block with mass M is attached to the lower end of a vertical, uniform rope with mass m and length…

A: In this problem, it is find the tension=?

Q: Why is the following situation impossible? Your 3.80-kg physics book is placed next to you on the…

A: Given that the mass of the book is m = 3.80 kg. the static friction is coefficient is 0.650. The…

Q: What would be the maximum weight of the crate so that the box does not slide if the coeffietint of…

A:

Q: A 78 kg crate rests on a rough horizontal surface. The coefficient of static friction and…

A:

Q: In the figure, a rectangular slab of slate rests on a bedrock surface inclined at angle θ = 28.4°.…

A: The given values are, θ=28.4°L=32.4 mT=5.92 mW=14.3 mρ=3.2 g/cm3=3.2×103 kg/m3μs=0.385A=6.05…

Q: If the coefficient of static friction between a table and a uniform massive rope is ls, what…

A:

Q: Solve the following problems: 1 Ccalculate the magnitude and direction of the resultant of the…

A: Required data can be observed from the given picture

Q: A box is made of wood as shown in the figure below if P=50 lb, the weight of the box =200 Ib, the…

A: TORQUE about G  P × R 50 ×1 =50 lb ft

Q: What is the direction of the static frictional force f on the crate from the wall? Horizontal,…

A: The answer is below

Q: In about 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by gripping the rafter…

A:

Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: