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- Lisa measured the coefficient of static friction between two pairs of running shoes and the track in Example 6.1 (page 159). If she wants to have an advantage in a race, which shoes should she wear, the ones with a high coefficient or the ones with the low coefficient of static friction? Explain.(a) When rebuilding her car's engine, a physics major must exert 300 N of force to insert a dry steel piston into a steel cylinder. What is the magnitude of the normal force between the piston and cylinder? (b) What is the magnitude of the force would she have to exert if the steel parts were oiled?A 260 N block is placed on a 3:4 [V: H] inclined plane. A 95 N force parallel to the incline acts up on the block. The coefficients on statics & kinetic friction between the block and the plane are 0.25 & 0.2 respectively. Determine whether the block is in equilibrium. a. not in equilibrium b. in equilibrium c. not enough data
- 30. An object is acted upon by an applied force F and a normal force N due to a surface with coefficients of static and kinetic friction µ, and µk, respectively. Which of the following statements is ALWAYS TRUE? A. The frictional force is opposite in direction to F. B. The static frictional force is equal to µ,N. C. The kinetic frictional force is proportional to N. D. The kinetic frictional force is greater than the static frictional force.7. Which of the following is the condition for the three-force theorem in mechanics? a. The force system should be in equilibrium only b. The force systems should be non-coplanar c. The system should be co-planar, parallel d. The force system should be in equilibrium, co-planar, concurrent, or parallel 8. Which of the following is the SI unit of force? a. Kg m b. Kg m2 c. Kg m2 /s d. Kg m/s2You need to push a couch 4 m to the other side of the room. After the initial push to get it going you push on the 90kg couch with a steady horizontal force of 600 N. The coefficient of kinetic friction between the couch and the floor is 0.6. 1. What is the magnitude and direction of the frictional force on the couch? 2. What is the magnitude and direction of the net force on the couch? 3. What is the magnitude and direction of the acceleration of the couch?
- If a horizontal force is applied to an object, how can you tell if an object will start moving? A.The object will start moving if any force is applied. B.The object will start moving if the applied force is greater than the maximum static friction. C.The object will start moving if the applied force is greater than the minimum static friction. D.The object will start moving if the applied force is greater than the maximum kinetic friction. E.The object will start moving if the applied force is greater than the minimum kinetic friction66.3 N 17. What is another term for Kinetic Friction? a. Dynamic Friction b. Starting Friction c. Sliding friction d. All of the above 18. A 300 N block is at rest on an incline plane having a slope of 4m vertical and 12 m horizontal. If the coefficient of friction between the block and the inclined plane is 0.18, solve the horizontal force needed that will cause the motion to impend? I 12 300 N a. 143.5 N b. 231.4 N c. 163.8 N d. 204.8 N2. A 1,480-N crate is being pushed across a level floor at a constant speed by a force F of 370 N at an angle of 20.0° below the horizontal, as shown in the figure a below. The floor has some amount of friction. 20.0° a a. Draw a free body diagram of all the forces on the crate. b. Write out one equation for the y component of the resultant force. Hint: The crate does not move in the y direction. Write out one equation for the x component of the resultant force. Hint: the crate moves in the x direction. C. d. Determine the Normal force. e. What is the coefficient of kinetic friction between the crate and the floor? (Enter vour answer to at least three decimal places.)
- 1. Consider the given coplanar nonconcurrent force system below. Determine the following: a. Summation of forces along x (N) Summation of forces along y (N) c. Resultant of all the forces (N) b. 800 lb 900 lb 3000 N 700 lb 600 lbAn 84 kg skier glides down a hill. The coefficient of kinetic friction μk = 0.15. The angle of incline is 30 degrees . a. Make a force diagram to calculate the Normal force (FN) from the hill. b. What is the value of the frictional force opposing the skier's slide down the hill? c. Determine the component of the gravitational force that is parallel to the hill. d. Then calculate the net force (Fnet) and the acceleration of the skier.A 10 kg box is on the horizontal surface with an exerting force of 95.3 N to start a box in the horizontal surface. a. Calculate the coefficient static friction. b. If the box continues to move with an acceleration of 1.71 m/s. What is the kinetic friction.