A vertical force F is applied to a block of mass m that lies on a floor. What happens to the magnitude of the normal force on the block from the floor as magnitude F is increased from zero if force is (a) downward and (b) upward? N
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- A block of mass 5.00 kg is initially at rest on a horizontal table. A string connects this block to another block of mass m = 2.00 kg that is suspended some distance above the ground. The string runs over a pulley. Ignore the mass of the string and pulley and assume the pulley is frictionless. The table has a coefficient of static friction of 0.48 and a coefficient of kinetic friction of 0.35.a) Draw a free-body diagram for the 5.00 kg block.b) Draw a free-body diagram for the 2.00 kg block.c) Is the system in equilibrium? Answer yes or no and justify your answer.d) If your answer to (c) is YES, what is the tension in the string? OR If your answer to (c) was NO, what is the magnitude of the acceleration of the system?A 32 kg crate rests on a horizontal floor, and a 61 kg person is standing on the crate.(a) Determine the magnitude of the normal force that the floor exerts on the crate. N(b) Determine the magnitude of the normal force that the crate exerts on the person. NA mass m1 = 12.0 kg sits on a level tabletop, and is attached to a second hanging mass m2 by a rope draped over a frictionless pulley. The coefficient of static friction between the 12.0-kg block and the tabletop is 0.450. What is the minimum mass m2needed so that the 12.0-kg block will just begin to slide?
- Estimate the magnitude of the normal force ?n acting on an apple that rests on a flat surface. ?≈ N Estimate the magnitude of the normal force on the apple when the surface is tilted at an angle of 30∘30∘ with respect to to the horizontal. ?≈ Na a constant horizontal force is applied to block A, which pushes against block B with a 20.0 N force directed horizontally to the right. In Fig. 5-51b, the same force is applied to block B; now block A pushes on block B with a 10.0 N force directed horizontally to the left. The blocks have a combined mass of 12.0 kg. What are the magnitudes of (a) their acceleration in Fig. 5-51a and (b) force Fa? A B (a) B (6)A 500 N block is being pushed along a frictionless horizontal surface by a force of 150 N at 40° to the horizontal. What is the normal force from the surface on the object? A) 96 N B) 150 N C) 404 N D) 500 N E) 596 N 150 N 500 N 40.0°
- A constant force Fa pushes a 22.5-kg box across a rough horizontal surface. The magnitude of Fa is 185 N and the force is inclined at an angle of θ = 30.0° below the horizontal. The coefficient of kinetic friction between the box and the surface is μk = 0.500. What is the magnitude of the box's acceleration?If the coefficient of static friction between all surfaces in contact is µg = 0.3 and a determine force P that must be applied to wedge A in order to lift the block weighing 500 N. The weight of wedge A is negligible compared to the block. B P14a
- x Incorrect The force P is applied to the 30-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 = 85 N, and (c) P = 131 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 us = 0.18 and µk = 0.12, respectively. The friction force is positive if up the incline, negative if down the incline. %3D P 30 kg 18° H, = 0.18 H = 0.12 12 Answers: (а) F 3D N (b) F (c) F = (d) P =A yoyo of radius R and mass M is released from rest with the string vertical and its top end fixed up a support as shown below. How fast is the center of mass of the yoyo moving when it has fallen a distance of 47 cm. Ignore the mass of the string and express your answer if m/sYou wish to help the child carry the backpack. Find the magnitude of force you should apply to the backpack with weight 34 lb and the angle to minimize the amount of force the child needs to provide if a is fixed at 20.1°. B = Child B W y α O You X