Answer number 3 n = mg = 35 kg x 9.8 m/s²= 343 Nfs =Hs n = 0.50 x 343 N= 171.5 NFp = fs = 171.5 N2. A boy exerts 50.0 N to push an object across a horizontal surface at constantvelocity. If the object has a mass of 10.0 kg, what is the coefficient of kinetic frictionbetween the object and the surface?3. How much force is needed in Problem 2 if the boy exerts the force at an angle of30.0° above the horizontal.The coefficient of sliding friction between a 50.0 kg ice and the pavement is0.06. What force is needed to move the ice at constant speed across the pavement?4. ACTIVITY 2: SOLVE THESE PROBLEMS FOR MEDirection: Answer the following problems. Write the given, what is required, sketch of thegiven, free-body diagram and the solution.1. Art pushes a 35 kg box across a wooden surface whose coefficient of static frictionforce is 0.50. How much force is needed to start the motion?Given:Required:m = 35 kg.FPv = 0.00 m/s Hs= 0.50shutterstock.com39874613zFP = fs.FW = n

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Answered: 3. How much force is needed in Problem…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter5: Displacement And Force In Two Dimensions

Section: Chapter Questions

Problem 2STP

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A block of ice (m = 15.0 kg) with an attached rope is at rest on a frictionless surface. You pull the block with a horizontal force of 95.0 N for 1.54 s. a. Determine the magnitude of each force acting on the block of ice while you are pulling. b. With what speed is the ice moving after you are finished pulling? Repeat Problem 71, but this time you pull on the block at an angle of 20.0.
(a) What is the minimum force of friction required to hold the system of Figure P4.74 in equilibrium? (b) What coefficient of static friction between the 100.-N block and the table ensures equilibrium? (c) If the coefficient of kinetic friction between the 100.-N block and the table is 0.250, what hanging weight should replace the 50.0-N weight to allow the system to move at a constant speed once it is set in motion? Figure P4.74
(a) Find the tension in each cable supporting the 6.00 102-N cat burglar in Figure P4.35. (b) Suppose the horizontal cable were reattached higher up on the wall. Would the tension in the other cables increase, decrease, or stay the same? Why? Figure P4.35
(a) A cat with a mass of 850 kg in moving to the right with a constant speed of 1.44 m/s. What is the total force on the cat ? (b) What is the total force on the cat if it is moving to the left?
(a) Find the tension in each cable supporting the 6.00 102-N cat burglar in Figure P4.35. (b) Suppose the horizontal cable were reattached higher up on the wall. Would the tension in the other cables increase, decrease, or stay the same? Why? Figure P4.35
(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? (b) During strenuous exercise it is possible to exert forces to the joints that are easily ten times greater than the weight being supported. What is the maximum force of friction under such conditions? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pain.
Give reasons for the answers to each of the following questions: (a) Clan a normal force be horizontal? (b) Can a normal force be directed vertically downward? (c) Consider a tennis ball in contact with a stationary floor and with nothing else. Can the normal force be different in magnitude from the gravitational force exerted on the ball? (d) Can the force exerted by the floor on the hall be different in magnitude from the force the ball exerts on the floor?
John is building a frictionless track with a block (? = 20.0kg) sliding on it (no flying up). The block is initially at rest at point A, and it is pulled by an external force ? = 60.0N (with an angle ? = 25.0 ° from the surface of the track) over a distance ? = 3.50 to point B. There are no external forces on the block after point B and the block continues to slide along the track until the magnitude of its velocity is ?C = 0.700m/s at point C. What is the height ℎ of point C (relative to point A)?
A cord passing over a pulley connects two masses, as shown, where m1 = 3.60 kg and m2 = 7.20 kg. The system accelerates with a magnitude of 1.26 m/s2. The coefficient of kinetic friction between the masses and the incline is the same for both masses. Assume the pulley is frictionless, and the cord is massless. (a) What is the coefficient of kinetic friction? (b) What is the tension (in N) in the cord?
Mazie stands on her kitchen floor. The coefficient of kinetic friction between her socks and the floor is 0.35, and the coefficient of static friction is 0.42. She has a mass of 58 kg. b. Mazie slides across the floor at a speed of 1.3 m/s. What is the force of kinetic friction acting on her? c. Mazie climbs up on the roof of her house, which has an angle of 25°. The coefficient of static friction between her and the roof is 0.35. Will she slip off the roof? Explain your answer. d. Given that μ s = 0.35, what is the maximum angle the roof could have without her slipping?
A man is trying to push a 75.0 kg rock across the ground by applying a constant force P at an angle θ = 27.5 ̊ below the horizontal. The coefficients of friction between the rock and the ground are μk = 0.430 and μs = 0.570. (a) If the rock is initially at rest, what force does the man need to apply to get it to start moving? (b) If the rock is already in motion, what force does he need to apply to get it accelerate at 2.75 m/s2?
8. The shown block is pulled across a horizontal surface with a constant speed by the force shown. If M = 5.0 kg, F = 14 N and the angle is 35º. What is the coefficient of kinetic friction between the block and the horizontal surface? Answers: a) 0.44 b) 0.33 c) 0.38 d) 0.28 e) 0.17

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3. How much force is needed in Problem 2 if the boy exerts the force at an angle of 30.0° above the horizontal.