46. A 9.3-kg child sits in a 3.7-kg high chair. (a) Draw a free- body diagram for the child, and find the normal force exerted by the chair on the child. (b) Draw a free-body diagram for the chair, and find the normal force exerted by the floor on the chair.

46. A 9.3-kg child sits in a 3.7-kg high chair. (a) Draw a free- body diagram for the child, and find the normal force exerted by the chair on the child. (b) Draw a free-body diagram for the chair, and find the normal force exerted by the floor on the chair.

Name: 46. • A 9.3-kg child sits in a 3.7-kg high chair. (a) Draw a free-bod
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Description: 46. • A 9.3-kg child sits in a 3.7-kg high chair. (a) Draw a free-body diagram for the child, and find the normal force exertedby the chair on the child. (b) Draw a free-body diagram for thechair, and find the normal force exerted by the floor on th

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter6: Applications Of Newton’s Laws Of Motion

Section: Chapter Questions

Problem 64PQ: A box rests on a surface (Fig. P6.64). A force Fapp is applied to the box in two different ways. In...

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A system can have a nonzero velocity while the net external force on it is zero. Describe such a situation.
A box rests on a surface (Fig. P6.64). A force Fapp is applied to the box in two different ways. In both cases. Fapp has the same magnitude, but in case 1 the force is directed below the horizontal, whereas in case 2 it is directed above the horizontal. a. Draw a free-body diagram for both cases. b. Now Fapp is increased in both cases until the box just barely remains at rest. Compare Fs, max for each free-body diagram. c. Use your answer to part (b) to find a best way to move a heavy desk. Describe and explain your solution.
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6. • • ● Two boxes are at rest on a horizontal table. The bottom box is pushed with a constant force (P) of 80 lbs at an angle of 38 degrees to the horizontal; this is not enough force to overcome the static friction between the bottom box and the table. Assume that the coefficient of static friction between the bottom box and the table is μ = 0.45, and that W₁ = 0.41W₂. Draw a free body diagram of box W₂. Determine the weight of each box (W₁ and W₂). Determine the normal force (N) acting on the bottom box. Determine the friction force (F) acting between the bottom box and the table. P. 38° W₁ = W₂ = N = Ff= W₁ W₂ Table lbs lbs lbs lbs
Summary • When an unbalanced force is applied to a mass, the object accelerates. The mathematical relationship between the mass, force, and acceleration is This relationship is known as Newton's Second Law. If you double the force applied to a constant mass, what happens to the acceleration? • If the same force that is applied to one mass is applied to a mass that is two times more than the first mass, what happens to the acceleration?
50. •A 25-kg crate rests on a level floor. A horizontal force of 50 N accelerates the crate at 1 m/s?. Calculate (a) the normal force on the crate, (b) the frictional force on the crate, and (c) the coefficient of kinetic friction between the crate and the floor.
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51. •A block of mass M rests on a 5.00-kg block which is on a tabletop (Figure 5-29). A light string passes over a frictionless peg and connects the blocks. The coefficient of kinetic friction at both surfaces µ equals 0.330. A force of 60.0 N pulls the upper block to the left and the lower block to the right. The blocks are moving at a constant speed. Determine the mass of the upper block. 5 kg Figure 5-29 Problem 51
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