A stationary 10kg object is sitting on the ground. The coefficient of static friction between the object and the ground is 0.8 and the coefficient of kinetic friction is 0.6. How much horizontal force needs to be applied in order to make the object move? O 68.6 N O 78.4 N O 58.8 N 88.2 N
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- In Problem 10, the mass of the sign is 25.4 kg, and the mass of the potted plant is 66.7 kg. a. Assuming the objects are in equilibrium, determine the magnitude of the static friction force experienced by the potted plant. b. What is the maximum value of the static friction force if the coefficient of static friction between the pot and the roof is 0.572?A 2.00-kg block is at rest on a horizontal plank that is 1.50 m long. When one end of the plane is raised to 0.50 m, the block starts sliding down. What is the coefficient of static/starting friction between the block and the plank? O 0.43 O 0.35 0.33 O 0.53A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle 0 below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The normal force on the box due to the floor is equal to: O W + P cos 0. O W + P sin 0. OW-P sin 0. O W + P. O W. W 0 P
- A 10kg block is pressed against a vertical wall and held in place by a force F of 150 N, 37 degrees above the horizontal. The coefficient of static friction is μs= 0.10. The magnitude and direction of the frictional force is A. 12 N downward B. 12 N upward C. 0.0 N D. 7.7 N downward E. 7.7 N upwardQUESTION 5 A 250 kg man climbe a 10 m, 40 kg ladder successfully to its top. The ladder is not at 60 degrees between the ladder and the flat ground. The contact between the ladder and the vertical wall is frictionless. What is the smallest value of statio friction between the ladder and the floor that would allow him NOT to slip? O0.50 Ob.0.55 Oc.0.60 Od.0.65 O0.70 QUESTION 6 A 2000 kg beam is attached to a wall at the beam's left end by a hinge to the wall. The beam is supported by a cable anchored in the wall and attached to the right ond of the 20 m beam. The cable is attached to the beam making a 40 degree angle between the horizontal beam and the cable. What must the tension in the cable be? Oa 8762 N Ob. 10540 N OC. 12793 N od 13647 N Oe. 15246 NSituation 2. A 500 N block is resting on an inclined plane. See figure below. coefficient of static friction, Hs 0.3, coefficient of kinetic friction, Hx = 0.2 P. s = 0.3 fn = 0.2 0=30° 7. Find the value P that will still make the block in equilibrium condition. а. 382 N b. 71 N с. 110 N d. 279 N
- A box ( m=8.79 kg) is placed on a horizontal surface with µs=0.2. If a force of 6.9 N is pushing the box to the right but the box does not move. What is the magnitude of the static friction force ( in N) during the effect of the 6.9 N force? Select one: O A. 6.90 B. 86.14 C. 92.639 O D. 32 O E. 17.2QUESTION 5 A 260 kg man climbs a 10 m, 40 kg ladder successfully to its top. The ladder in net at 60 degrees between the ladder and the flat ground. The contact between the ladder and the vertical wall is frictionless. What is the smallest value of static friction between the ladder and the floor that would allow him NOT to slip? O a. 0.50 Ob. 0.55 Oc.0.60 Od.0.05 O.0.70 QUESTION 6 A 2000 kg beam is attached to a wall at the beam's left end by a hinge to the wall. The beam is supported by a cable anchored in the wall and attached to the right end of thee 20 m beam. The cable is attached to the beam making a 40 degree angle between the horizontal beam and the cable. What must the tension in the cable be? O a. 8762 N O b. 10540 N O c. 12793 N Od. 13647 N Oe. 15246 N1. A block is placed on a wooden plank, which is initially horizontal. One end of the plank is slowly raised to make it more and more inclined, and for a while the block stays in place on the plank and doesn't slide due to static friction. Finally, when the plank reaches an incline of 56.3o above horizontal, the block begins to slide. What is the coefficient of static friction between the block and the plank? 1.50 1.00 2.00 0.500 2. Continuing the story from the previous question... after the block begins sliding down the incline at 56.3o, you measure its acceleration down the plank as 7.42 m/s2. What is the coefficient of kinetic friction between the block and the plank? 0.136 0.241 0.190 0.562
- Côncept Example 9. A 225-kg crate rests on a surface that is inclined em are presented in Multiple- above the horizontal at an angle of 20.0°. A horizontal force (magnitude 535 N and parallel to the ground, not the incline) is required to start the into solving crate moving down the incline. What is the coefficient of static friction s an angle of hetic friction * initial speed between the crate and the incline? 119. The drawing shows a 25.0-kg crate that 球 Is initially at rest. Note that the view is one look- ing down on the top of the crate. Two forces, F, and F, are applied to the crate, and it begins to +y does the box 2- move. The coefficient of kinetic friction =0.350. 55.0 es, a force of 54.0 N F, between the crate and the floor is u = current of the Determine the magnitude and direction (relative Top view of east. When in a direction to the x axis) of the acceleration of the crate. ADN (NG N 88.0 NA 10.0-kg box is at rest on a concrete floor. The coefficient of static friction between the box and the floor is 0.75 and the coefficient of kinetic friction is 0.62. A person pushes the box by applying a force of 100.0 N. What happens to the box?The 633-N force is applied to the 106-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. P = 633 N 38° = 0.66 H = 0.43 Answer: F = i N