5. A 10-kg box is being pulled across the table to the right at a constant speed with a force of 50N, directed 30 degrees below the horizontal. a.) Calculate the force of friction acting on the box. b.) Calculate the normal force acting on the box.
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- 2. Mass 1 = 3.5 kg brick is placed on an inclined plane which forms an angle of 25° with the horizontal. There is a string attached to the brick that passes over a pulley and connects to a Mass 2 = 1.15 kg. The coefficient of static friction between the brick and the plane is 0.25. a. What is the acceleration of the brick? b. What is the tension in the string? [3318. According to Newton's third law, every force is accompanied by an equal and opposite reaction force. The reason that these forces do not cancel each other is a. the action force acts for a longer time period b. the two forces are not always in the same direction c. one of the two forces is greater than the other d. the two forces act upon different objects; only forces on the same object can balance each other. e. . nonsense! They do cancel each other. Objects accelerate because of the presence of a third force Justify your answer:Two masses, m, = 2.16 kg and m, = 9.71 kg are on a horizontal frictionless surface and they are connected together with a rope as shown in the figure. The rope will snap if the tension in it exceeds 50.0 N. What is the maximum value of the force F which can be applied? Submit Answer Tries 0/10 What is the acceleration of the whole system, when this maximum force is applied? 4.212m/s 2 Submit Answer Incorrect. Tries 1/10 Previous Tries
- 4. The 100-kg crate is subjected to the forces shown. If it is originally at rest, determine the distance it slides in order to attain a speed of v= 6 m/s. The coefficient of kinetic friction between the crate and the surface is Hk = 0.2. 500 N 400 N 30° 45°MCQ 4. The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes a 20° angle with the ground. The normal force of the level ground on the first box is NL; the normal force of the ramp on the second box is NR. Which statement is correct? a. NR= NL = mg. b. N₁ mg; NR= mg sin 20°. C. NL = mg; NR = mg cos 20°. d. Nr.= mg; NR= -mg cos 20°. e. NR=-NL = -mg.QUESTION 10 Which of the following statements in regard to the acceleration due to gravity is true? a. The acceleration due to gravity is independent of the mass of the falling object. Ob. The acceleration due to gravity has a magnitude of 8.81 m/s at or near the surface of the earth. C. The acceleration due to gravity increases with decreasing wind resistance and decreases with increasing wind resistance. d. The acceleration due to gravity has a vector component that is parallel to the surface of the earth. O e. The acceleration due to gravity is greater for a greater mass and smaller for a smaller mass.
- 3.) A 200 g toy call rolls down an inclined plane with angle 50°. Determine the acceleration of the car. How far would the car travel in 4 s?10. The drawing shows a baggage carousel at an airport. Your suitcase has not slid all the way down the slope and is going around at a constant speed on a circle (r = 10.0 m) as the carousel turns. The coefficient of static friction between the suitcase and the carousel is 0.70, and the angle 0 in the drawing is 23.0°. Find the speed of your suitcase. m/s 60 ssf60 ssf60 ssf60 ssf60 s. sf60 ssf60 ssf60 sio0 ssfo Ossf60 ssf60 sf60 st ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssfe4. A 50.0-kg crate is being pulled along a horizontal smooth sSurface. The pulling force is 10.0 N and is directed 20.0° above the horizontal. What is the magnitude of the acceleration of the crate? A) 0.0684 m/s2 B) 0.188 m/s2 C) 0.200 m/s2 D) 0.376 m/s2 E) 0.0728 m/s2 Final formula: Required steps: 1) Draw free body diagram 2) Choose reference frame 3) Find vectors components 4) Apply Newton's 2nd law 5) Solve for a algebraically 6) Check units 7) Substitute numerical values
- 1. A box with mass m is dragged across a level floor with coefficient of kinetic friction by a rope that is pulled upward at an angle above the horizontal with a force of magnitude F. In terms of the variables given, write an expression for the mass of the box needed so that it moves across the floor at a constant speed.A lead fishing weight of mass 0.20 kg is tied to a fishing line that is 0.50 mm long. The weight is then whirled in a vertical circle. The fishing line will break if its tension exceeds 80 N. A) bottom B)At what speed will the string break?