Calculate the magnitude of the force P needed to push the block of mass 15 kg at constant velocity along a level surface as shown. The coefficient of kinetic friction between the surfaces is 0.35. p15°
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- necinons Deter mine the required weight o block A so that block B will impend upuord, assuming 47N Force ats perperdiular to block A. the weight F the block B is 547 N the coeppicient of triction between block A and the wall, as well as block B and the inclined Hloor is ay and rope. the Floor rs indlined at 470 witha respect to the horizortal plare. whereas 0-25 for the Fixed anom B417N 구나구N 47° 2/2Hiw Friction P:The 300 Ib block shown in fig hae impanding motion up the plane Caused by the horiZoutal foree of 700 Ib find the Coefficrent of static friction befween the Contact Surfaces. 300 700Ib 4-ImAn inextensible cable of negligible mass is used to drag a log on a roughhorizontal surface. The tension in the cable is 850 N and it acts at an angle of 35°to the horizontal. The log is dragged over a distance of 45m. The frictional forceexperienced by the log is 150 N. Calculate the net force acting on the log.
- You are climbing on a hill that is inclined at 22º with the horizontal and you wish tobuild a rope tow to pull yourself up. Ignoring friction, calculate the tension you needed on therope to give your body that has a mass of 55kg a 1.2m/s^2 acceleration. What if you are toconsider the friction of 150N, what is the value the tension and coefficient of friction?A 100-N block on a rough 30o-incline is acted upon by a force P as shown causing it to accelerate at 2 m/s2 up the plane. The coefficient of kinetic friction is 0.30. (a) Draw the FBD of the block (b) Find the magnitude of P.Shoes made for the sports of boulderingand rock climbing are designed to provide a great deal of frictionbetween the foot and the surface of the ground. Such shoes on smoothrock might have a coefficient of static friction of 1.2 and a coefficient ofkinetic friction of 0.90. If the person steps onto a smooth rock surface that’s inclined at an angle large enough that these shoes begin to slip, what will happen? (a) She will slide a short distance and stop; (b) she will accelerate down the surface; (c) she will slide down the surface at constant speed; (d) we can’t tell what will happen without knowing her mass.
- A force of 600 N is applied on a block of mass M to pull it at a constant velocity up the incline at an angle of 30degrees with the horizontal. The coefficient of kinetic friction between the surface of the incline and the block is 0.5. Calculate the mass of the block.A 0.85 kg block of wood is stationary on an incline that is15◦above horizontal. A force of 3.0 N is being applied toit 75◦below horizontal, directly into the incline (the force isperpendicular to the incline). What is the minimum coefficientof static friction required to keep the block stationary?The glue on a piece of tape can exert forces. Can theseforces be a type of simple friction? Explain, consideringespecially that tape can stick to vertical walls and even toceilings.
- A horizontal force of 200 N is used to push a 50.0-kg packing crate a distance of 6.00 m on a rough horizontal surface. If the crate moves at constant speed, the coefficient of kinetic friction between the crate and surface.A mass is given an initial velocity ?0 = 3.4 ?/? up a 15° incline. (a) If the coefficient ofkinetic friction between the mass and the incline is ?? = 0.26, how long before the masscomes to rest? (b) If the coefficient of static friction is ?? = 0.29, will the mass slideback down the incline?(b) The coefficient of kinetic friction between a 40 kg crate and the ware- house floor is 70% of the corresponding coefficient of static friction. The crate falls off a forklift that is moving at 3 m/s and then slides along the warehouse floor for a distance of 2.5 m before coming to rest. What is the coefficient of static friction between the crate and the floor?