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- A stubborn dog is being walked on a leash by its owner. At one point, the dog encounters an interesting scent at some spot on the ground and wants to explore It in detail, but the owner gets impatient and pulls on the leash with force along the leash. (a) What is the magnitude of the pulling force? (b) What angle does the leash make with the vertical?A 15-kg sled is pulled across a horizontal, snow-covered surface by a force appiled to a rope at 30 degrees with the horizontal. The coefficient of kinetic friction between the sled and the snow is 0.20. (a) If the force Is 33 N, what is the horizontal acceleration of the sled? (b) What must the force be in order to pull the sled at constant velocity?How would (a) an updraft affect a skydiver in reaching terminal velocity? (b) a downdraft?
- M Alt Alt LATITUDE E6430 Name: Directions: All problems must be solved using the problem-solving method, givens, unknowns, equation, cubstitution, and solve with correct unit to receive full credit. Also, all force problems require an FBD. P.4D-Practice-Force of Friction 1. A 38 kg crate rests on a floor. A horizontal pulling force of just more than 170 N is needed to start thecrate moving. What is the coefficient of static friction between the crate and the floor?A supermarket pushcart is being pushed at 45 degrees with respect to the horizontal from the starting point to the cashier, which is 25 feet away. The cart is 5kg, it contains 2 boxes of 10-1b flour and seven packs of half-kilogram sugar. The coefficient of friction between the wheels and the floor is 0.03. a. What force is required? b. How much force is required?8. A block is at rest on a rough inclined plane and is connected to an object with the same mass as shown. The rope may be considered massless; and the pulley may be considered frictionless. The coeffi- cient of static friction between the block and the plane is us; and the coefficient of kinetic friction is k 0 A. g D. g - Hk sin(0) m a. What is the magnitude of the static frictional force acting on the block? B.m g [1 - sin(0)] C. mg D. mg cos(0) B. g - Hk cos(0) A. m g sin(0) E. mg [1 - cos(0)] b. If the rope were cut between the block and the pulley, what would be the magnitude of the acceleration of the block down the plane? C. g [sin(0) - μ cos(0)] sin(0)] c. If the mass of the suspended object is doubled, what will be the acceleration of the block up the plane? B. g [2 tan(0) - uk sin(0)] D. 2g [μ sin(0) - cos(0)] m E. g [tan (0) A. g [2 - μk sin(0)] C. g [2 cos(0) - μ sin(0)] E. g [2 sin(0) Hk Cos (0)]. -
- Help. Same2. A packing crate rests on a ramp that makes an angle with the horizontal. The coefficient of kinetic friction is 0.50 and the coefficient of static friction is 0.75, a. As the angle is increased, find the minimum angle at which the crat start to move. b. At this angle, find the acceleratioonce the crate starts to move. C. how much time is required for the crate to slip 20ft. along the inclined plane?n .The block shown is pulled across the rough horizontal surface at a constant speed by the force shown. If m=5 kg, F=11, and 0 = 37°, what is the coefficient of kinetic friction between the block and the surface? consider g = 10 m/s?. m A. 0.3025 B. 0.3525 C. None D. 0.4025
- A sled is on a horizontal surface and a rope with tension T is pulling on it at an angle 0 above the horizontal. The sled had mass M and does not move due to the frictional force. In this case the coefficient of friction is u,. In terms of the variables given and g, what is the magnitude of the frictional force in this case? Select one: a. H, Mgcos0 b. Tcose С. Tsin@ d. H, Mgsine2. Two masses were connected by a frictionless pulley and is placed in an inclined plane with kinetic friction coefficient of 0.2. If we let mass m2 to move at a constant speed downwards, give the following: a. Draw the FBD and write the summation of all forces acting on the masses. b. Solve for mass m2 if mass mı = 4kg. c. Find the tension force of the string.D. 100 kg container with water; Weight= _____ N;friction = _______ N E. 200 kg Refrigerator: Weight = _____ N;friction = _________ N With the values that you get using the Phet simulation software, what is the factor that affects static friction? Justify your answer. _______________