The coefficient of kinetic friction is less than the coefficient of static friction. a) True b) False
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The coefficient of kinetic friction is less than the coefficient of static friction.
a) True
b) False
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- f the mass of the box is 2.55 kg, the angle of the incline is 40o, and the coefficient of static friction, , between the crate and the incline is 0.37, rank the forces according to their magnitudes. Prompt 1The weight of the block Answer for prompt 1 The weight of the block Prompt 2The Static Friction Force between the block and the ramp Answer for prompt 2 The Static Friction Force between the block and the ramp Prompt 3The Normal Force between the block and the ramp Answer for prompt 3 The Normal Force between the block and the ramp Prompt 4The Tension in the stringWhat is the direction of the net Force (F= F₁+F₂), measured in degrees in CCW direction from the +x axis? F₂=18N 50 y 30° F=30N xA block weighing 80N rests on a plane inclined at 20o to the horizontal. The coefficient of static friction is 0.25, while the coefficient of kinetic friction is 0.15. a) What is the minimum force |F|, parallel to the plane, that will prevent the block slipping down the plane? b) What is the minimum force |F| that will start the block moving up the plane? c) What force |F| is required to move the block up the plane at constant speed?
- Friction between surfaces that slide over each other is called kinetic friction, whereas friction between surfaces at rest with respect to each other is called static friction. a) True b) FalseWhile moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction between the box and the floor is 0.393. The pushing force is directed downward at an angle below the horizontal. When is greater than a certain value, it is not possible to move the box, no matter how large the pushing force is. Find that value of 0. Number i UnitsA block weighing 38 kg is on an incline with a slope of 17o. If the block is at the verge of sliding down the incline, what is the static frictional force of resistance? A block weighing 25 kg is on an incline with a slope of 28o. If the block is at the verge of sliding down the incline, what is the static friction coefficient?
- 5. (a) The weight of the block in the diagram is 54 N. The coefficient of static friction between the block and the vertical wall is 0.570. What minimum magnitude of the force F is required to prevent the block from sliding down the wall? (Note that the static frictional force is directed upward, parallel to the wall) Block F40.0° Vertical wall (b) A 104 kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is μ = 0.651. (i) What is the magnitude of the frictional force? (ii) If the player comes to rest after 1.13 s, what is his initial speed?Two masses are connected to a string whose mass is zero. They are suspended from a pulley that connects two inclined planes. The mass ml is 8.0 kg, and the mass m2 is 12.0 kg. The kinetic coefficient of friction for the two inclined planes is 0.21. a) Determine the acceleration of the two masses. b) Determine the tension of the string. m 34 m₂The coefficient of static friction is ___________a) Less than the coefficient of kinetic frictionb) Greater than the coefficient of limiting frictionc) Equal to the coefficient of kinetic frictiond) Equal to the tangent of the angle of friction
- What is the magnitude of the normal force the object is receiving from the surface if the coefficient of friction between the object and the surface it is on is 0.26 and it experiences a force of friction of magnitude 59.5N? Fn = unitCalculate the ratio of the drag force on a jet flying at 949 km/h at an altitude of 9.2 km to the drag force on a prop-driven transport flying at half that speed and altitude. The density of air is 0.43 kg/m³ at 9.2 km and 0.69 kg/m³ at 4.6 km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C. Number i UnitsThe inclination of a frictionless inclined plane is θ and an object of mass m awaits at its top. What is the magnitude of the normal force exerted by the plane on the object during its motion on the inclined plane after the object is released?a) mg sinθ b) mg tan θ c) mgd) mg cosθe) mg cotθ