-8. A block that weighs 60 N is initially at rest on a horizontal surface. A horizontal force F, of magnitude 22 N and a vertical force F, are then applied to the block. The coefficients of friction for the block and the surface are u, = 0.50 and µk 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of F2 is (a) 10 N, (b) 20 N F2
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- You are pulling your luggage in an air port for an international flight. You know not to pack too much else they charge you extra fees so you weighted your luggage at home to be 22.0 kg. You exert a pull of 46 N in magnitude and at 24 degrees above the horizontal to ensure you can walk at a constant speed on the carpeted floor. What is the coefficient of friction between the caster wheels and the carpet?A 235 N crate rests on a ramp; the maximum angle just before it slips is 27.8° with the horizontal. What is the coefficient of static friction between crate and ramp surfaces? Answer:A 423 N crate rests on a ramp; the maximum angle just before it slips is 26.4° with the horizontal. What is the coefficient of static friction between crate and ramp surfaces?
- Blocks A and B each have a mass m = 15 kg. The coefficient of static friction between A and B is μg = 0.28. The angle shown is 0 = 47°. Neglect any friction between B and C. A B P C Determine the largest horizontal force P that can be applied so that A will not slip on B. P= number (rtol=0.05, atol=1e-08) NA crate remains stationary after it has been placed on a ramp inclined at an angle with the horizontal. Which of the following statements must be true about the magnitude of the frictional force that acts on the crate? O It is least equal to the weight of the crate. O It is equal to n. O It is larger than the weight of the crate. O It is greater than the component of the gravitational force acting down the ramp. O It is equal to the component of the gravitational force acting down the ramp.Question 8. A 5.41-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.369. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an acceleration whose magnitude is 2.64 m/s², and (c) accelerating downward with an acceleration whose magnitude is 2.64 m/s².Ans: 19.56 N; 24.83 N; 14.29 N
- Friction can be helpful in some situations but cause in other situations. (a) Describe two situations in which friction is helpful for an object moving on a horizontal surface.(b) Describe two situations in which it would be ideal if there were no friction when an object moves across a horizontal surface.A girl exerts a horizontal force of 133 N on a box with a mass of 33.2 kg. (a) If the box doesn't move, what's the magnitude of the static friction force (in N)? N (b) What is the minimum possible value of the coefficient of static friction between the box and the floor? (Assume the box remains stationary.)Block 1 (10 kg) is pulled by a rope from left to right up a ramp which is inclined 50 degrees from the horizontal. The rope pulls on block 1 with a force of 150 N parallel to the surface of the inclined plane. The coefficient of kinetic friction between the block and the surface equals 0.3. Weight force on block 1 by EarthW1E = i + j N Tension force on block 1 by RopeT1R = i + j N Normal force on block 1 by SurfaceN1S = i + j N Frictional force on block 1 by Surfacef1S = i + j N What is the acceleration a of block 1?a = i + j m/s2