The force P is applied to the 50-kg block whe. rest. Determine the magnitude and directio friction force exerted by the surface on the (a) P = 0, (b) P = 200 N, and (c) P = 250 N. (
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- The 40-lb spool is suspended from the hanger GA and rests against a vertical wall. The center of gravity of the spool is at G and the weight of the hanger is negligible. The wire wound around the hub of the spool is extracted by pulling its end with the force P. If the coefficient of static friction between the spool and the wall is 0.25, determine the smallest P that will extract the wire.A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The coefficients of static and kinetic friction for the two points of contact are as shown. Determine whether the plank moves from the position shown if (a) the plank is placed in position before the drum is set in motion; and (b) the plank is first placed on the support at A and then lowered onto the drum, which is already rotating.The 3600-lb car with rear Wheel drive is attempting to tow the 4500-lb crate. The center of gravity of the car is at G, and the coefficients of static friction are 0.6 at B and 0.2 at C. Determine if the crate will slide.
- The 320-lb homogeneous spool is placed on the inclined surface. Determine the vertical force P that is required to keep the spool in the position shown. Assume that there is enough friction to prevent slipping at A.6/4 The coefficients of static and kinetic friction be- tween the 100-kg block and the inclined plane are 0.30 and 0.20, respectively. Determine (a) the fric- tion force F acting on the block when P is applied with a magnitude of 200 N to the block at rest, (b) the force P required to initiate motion up the in- cline from rest, and (c) the friction force F acting on the block if P = 600 N. P 100 kg 20° D 15° Problem 6/4 Hg = 0.30 μk = 0.20This climber (mass=52kg) is maintaining this posture while grabbing onto a rock at P3 and reaching for the wall with her right hand (no contact of wall and right hand). The rock at P1 applies a force of 187.4N at an angle of 140.2 deg from the positive x axis on her right foot at P1. The rock at P2 and the climber's pants have a coefficient of static friction of 0.78 and the y component of the force of the rock on her pants is 144.0 N upward. The rocks at P1 and P2 are vertical surfaces. The friction forces acting at P1 and P2 are as large as friction will allow. Analyze the forces in the frontal plane as shown and show mechanical rationale for each question. a) What is the net interaction of the her left hand on the rock at P3? b) Which surface (P1 or P2) has a lower coefficient of static friction? If she took off her shoes and tried to hold this position with her socks (coefficient of static friction of her socks and rock is 0.78), will she be able to maintain static equilibrium? C)…
- The two 200-N blocks are pushed apart by the 15 degrees wedge of negligible weight. The angle of static friction is 10 degrees at all contact surfaces. Determine the force P required to start the blocks moving.A block of wood of mass 20 kg is supported as shown in the diagram. If the string suspending the 10 kg mass and connected to the 20 kg mass is light and inextensible and the coefficient of friction, u between the mass and the plane is 0.3 neglecting friction in the pulley (i) Compute the acceleration of the block. (ii) Determine the tension in the rope. 20 kg 10 kg 30°The two 200-lb blocks are pushed apart by the 15° wedges of negligible weight.The angle of static friction is 12° at all contact surfaces.Determine the force P required to start the blocks moving.
- 1. In the figure shown, each block has a mass of 2-kg. Determine the force P needed to start block B to the left. The angle of friction for all surfaces in contact is A 16.7°. 20° P Bin the figure, the coefficient of friction between the blocks and the planes is 0.2 and the two blocks are moving along the plane as shown. What is the unbalance force equations for each object.The force P is applied to the 53-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P=185 N, and (c) P=292 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are ₁-0.24 and U-0.19, respectively. The friction force is positive if up the incline, negative if down the incline. Answers: (a) F- (c) F= 53 kg 14° (d) P= (b) F- i i i 23 P=0.24 P₁=0.19 N N N N