6. A box is on a ramp inclined at 25° to the horizontal. The coefficient of static friction is .30, and of kinetic friction .20. M₂=30 Me=20m a. The box slides down the ramp. b. The box stays on the ramp without slipping. c. The box first slips, but then stays fixed after slowing down. d. We need the mass of the box to answer the question. 3250 w th mg OL 7 = MgCOSTS
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- 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)]. -1. A child stands on a bathroom scale while riding in an elevator. The child's weight when the elevator is not moving is 490 N. What does the scale read when the elevator accelerates upward at 1.3 m/s^2?a. 490 N b. 555 N c. 65 N d. 425 N 2. The force that one surface exerts on another when the two rub against each other is called _____. a. gravity b. inertia. c. friction. d. acceleration. answer only8. An object is pulled across a rough horizontal surface with an applied force of 300 N [40o below the horizontal]. The applied force is slowly rotated down toward the horizontal, decreasing the 40o angle. What will happen to the force of friction acting on the object and the acceleration? a. Both increase.b. Both decrease.c. Friction decreases and acceleration increases.d. Friction increases and acceleration decreases.e. None of the above statements are accurate.
- A force of 1.5 N makes an angle of 12° (counter-clockwise) with the +X axis. The Y component of the force is N. O a. 1.47 N O b. 0.31 N Oc.0.32 N O d. -2.35 N1. You are trying to lift a box of weight W' vertically off the floor. You apply a force, Fup, on the box trying to lift it but the box does not move. If N is the normal force on the block from the floor while you are trying to lift it, which relationship below must be true? a. N= W b. N+ Fup W d. N+ Fup = WAsap
- 2. The coefficient of static friction between a heavy box and a ramp is 0.45. The weight of the box is 1.2x103 N, and the ramp has an incline of 16o. What minimum force is needed for the box to overcome the force of static friction?a. 1.9x 102 Nb. 3.8x102 Nc. 5.2x102 Nd. 7.4x102 Ne. 1.5x102 N. A 75-N box rests on a perfectly smooth horizontal surface. The minimum force need to start the box moving is a.75 N. b. 7.5 N. c. 750 N. d. any horizontal force greater than zero.5. A mass of 10kg sits on a level surface. One end of the surface is raised until the block begins to slide down the ramp at a constant velocity and angle of 20⁰. c. What is the Normal Force, N? d. What is the Frictional Force, Ff?
- 6. The coefficient of kinetic friction between the block and the inclined surface of the figure below is 0.3 and the coefficient of static friction is 0.9. Each block is 1 kg. The pulley is frictionless and the string is massless. What is the magnitude of the acceleration of the blocks if the system is released from rest? A. 0 m/s² B. 0.55 m/s² C. 0.97 m/s² D. 1.3 m/s² E. 2.2 m/s² ys 1AC 1kg 1kg 40⁰17. A force F is used to hold a block of mass m = 4.62 kg on an incline as shown in the diagram. The plane makes an angle of 0 = 26.9° with the horizontal and F is perpendicular to the incline. The coefficient of static friction between the plane and the block is 0.206. What is the minimum force, F, necessary to keep the block at rest? F a. 59.1 N b. 118 N c. 45.3 N d. 19.6 N e. 88.6 N2. The coefficient of static friction between a heavy box and a ramp is 0.45. The weight of the box is 1.2x10 N, and the ramp has an incline of 16°. What minimum force is needed for the box to overcome the force of static friction? a. 1.9x 10² N b. 3.8x10? N с. 5.2х102 N d. 7.4x10² N е. 7.4x102 N 1. As you increase the angle on a banked curve for a car moving in The speod the car can safely travel around the tum increases