Static vs Dynamic Force Analysis Quiz
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Questions and Answers

What is the purpose of dynamic force analysis?

  • Evaluating input and joint forces in motion (correct)
  • Determining static forces
  • Analyzing torque equilibrium
  • Calculating mass of the body

    • How is the inertia force defined?

  • Equal to the weight of the body
  • Dependent on the body's volume
  • Opposite in magnitude to the accelerating force (correct)
  • Equal to the gravitational force

    • What is the relationship between inertia force and linear acceleration?

  • Inertia force equals linear velocity
  • Inertia force is independent of linear acceleration (correct)
  • Inertia force decreases with linear acceleration
  • Inertia force is proportional to linear acceleration

    • What does the inertia torque represent?

    <p>Torque causing rotational acceleration</p> Signup and view all the answers

    How can a system of forces acting on a rigid body be represented?

    <p>By a couple and a parallel force</p> Signup and view all the answers

    In what direction does the force passed through the center of gravity act?

    <p>Parallel to the resultant force</p> Signup and view all the answers

    What is the term used to describe the curve traced by a particle while moving along a screw thread?

    <p>Helix</p> Signup and view all the answers

    Which type of screw threads are mainly used for tightening pieces together like bolts and nuts?

    <p>V-threads</p> Signup and view all the answers

    What is the relationship between pitch, lead, and number of threads in a single-threaded screw?

    <p>Lead = Pitch × Number of threads</p> Signup and view all the answers

    Which principle states that the resultant force acting on a body and the reversed effective force are in equilibrium?

    <p>D-Alembert's Principle</p> Signup and view all the answers

    What is the inertia force described as in D-Alembert's Principle?

    <p>Reversed effective force</p> Signup and view all the answers

    Which device works on a principle similar to that of an inclined plane for lifting heavy loads?

    <p>Screw Jack</p> Signup and view all the answers

    What is the product of mass and linear acceleration of the center of mass of a body according to D-Alembert's Principle?

    <p>$m \cdot a$</p> Signup and view all the answers

    Which type of screw threads offer more frictional resistance and prevent nuts from slackening?

    <p>V-threads</p> Signup and view all the answers

    What is the slope or inclination of the thread with the horizontal known as?

    <p>Helix angle</p> Signup and view all the answers

    What does FI represent in D-Alembert's Principle?

    <p>Inertia force</p> Signup and view all the answers

    What is the total thrust from the propeller in Example 1?

    <p>100 kN</p> Signup and view all the answers

    What is the torque required to lift a load by a screw jack if the pitch of the screw is represented by p, mean diameter by d, helix angle by a, effort applied at the circumference by P, load to be lifted by W, and coefficient of friction by µ?

    <p>$W \tan (a+f)$</p> Signup and view all the answers

    In Example 2, what power is absorbed when the shaft runs at 105 r.p.m. carrying a load of 150 kN under uniform pressure?

    <p>13.64 kW</p> Signup and view all the answers

    In the context of a square threaded screw, what is the normal reaction given the helix angle a?

    <p>$W \cos a$</p> Signup and view all the answers

    In the context of collar bearings, what is the external diameter of the collars in Example 1?

    <p>600 mm</p> Signup and view all the answers

    What is the total torque required to overcome friction in a turning pair if an effort P1 is applied at the end of a lever of arm length l?

    <p>Equal to the torque applied at the end of the lever</p> Signup and view all the answers

    In a journal bearing, what forms a line contact when not lubricated?

    <p>The lubricant layer</p> Signup and view all the answers

    What does the coefficient of friction value of 0.12 represent in the context of collar bearings?

    <p>Frictional force</p> Signup and view all the answers

    What angle is represented by 2 in the context of V-thread?

    <p>Angle of the V-thread</p> Signup and view all the answers

    What does the variable 'n' represent in the given context of collar bearings examples?

    <p>Number of collars required</p> Signup and view all the answers

    How is the speed of rotation (N) related to angular velocity (ω) in the provided text?

    <p>$2π × N$</p> Signup and view all the answers

    How is the normal reaction calculated for V-thread where the axial component must be equal to the axial load W?

    <p>$W\cos 2$</p> Signup and view all the answers

    What is NOT true about the torque required to overcome friction between the screw and nut?

    <p>$\frac{R_1 + R_2}{R}$</p> Signup and view all the answers

    What happens to the reaction R in a journal bearing when lubricated?

    <p>It acts at 'Point A'</p> Signup and view all the answers

    What is assumed to be proportional for the rate of wear in rubbing surfaces?

    <p>The product of intensity of pressure and velocity of rubbing surfaces</p> Signup and view all the answers

    What is the formula for the vertical load acting on a small ring of radius r along a cone?

    <p>$dW = dW_n \sin a$</p> Signup and view all the answers

    In the context of uniform wear, what is the relationship between the intensity of pressure and the distance from the central axis?

    <p>$p_r = C / r$</p> Signup and view all the answers

    What is the formula for the total frictional torque acting on a conical pivot bearing?

    <p>$T_r = \int p_n \times 2 \pi r , dr$</p> Signup and view all the answers

    When using a trapezoidal or truncated conical pivot bearing, what is considered to be uniform?

    <p>Pressure distribution</p> Signup and view all the answers

    What is the total torque acting on a bearing obtained by integrating the value of $T_r$ within the limits between $r_1$ and $r_2$?

    <p>$T = \int_{r_1}^{r_2} T_r , dr$</p> Signup and view all the answers

    For a collar bearing, what is its primary function?

    <p>To carry vertical loads</p> Signup and view all the answers

    What is the coefficient of friction assumed in Example 1 concerning power lost in friction?

    <p>$0.05$</p> Signup and view all the answers

    In Example 1, if the shaft diameter is given in millimeters, what is its equivalent value in meters?

    <p>$0.075$ m</p> Signup and view all the answers

    What is the total power absorbed in friction for the conical pivot bearing supporting a load of 20 kN with a cone angle of 120º?

    <p>$6.322$ kW</p> Signup and view all the answers

    What is the coefficient of friction represented by in the given text?

    <p>ø</p> Signup and view all the answers

    In the context provided, what does the angle ø represent?

    <p>The angle between the resultant force and RN</p> Signup and view all the answers

    Which type of pivot may have a flat surface or conical surface?

    <p>Flat pivot</p> Signup and view all the answers

    What type of bearing is typically used in modern practice for large thrusts, like in propeller shafts of ships?

    <p>Thrust bearings</p> Signup and view all the answers

    What parameter determines the rate of wear according to the given text?

    <p>Velocity of rubbing surfaces</p> Signup and view all the answers

    In the context provided, what is represented by T = W.rtanø?

    <p>Frictional torque</p> Signup and view all the answers

    What does a truncated pivot represent?

    <p>A pivot with a cone that is cut off</p> Signup and view all the answers

    What does wear being uniform throughout the bearing surface imply?

    <p>&quot;Different radii experience different rates of wear.&quot;</p> Signup and view all the answers

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