5.3. Dynamic equations help determine

Try these first

1. 1.

   What is a dynamic equation?

   Hint

   Think about what happens when objects are in motion.

2. 2.

   Define inertial force.

   Hint

   Consider an object's resistance to changes in its motion.

3. 3.

   What do dynamic equations help to determine?

   • Only static forces
   • Forces
   • reactions
   • and net driving torque in dynamics
   • Just the motion paths

   Hint

   Think about the scenarios in dynamic analysis.

4. 4.

   True or False: Inertial force is always directed in the same direction as the acceleration.

   • True
   • False

   Hint

   Review the relation between mass, acceleration, and force.

5. 5.

   Given a slider-crank mechanism where the crank radius is 0.15 m and the angular velocity is 10 rad/s, calculate the piston acceleration at a crank angle of 30 degrees. Assume the connecting rod length is 0.5 m.

   Hint

   Make sure to convert angle measures where necessary and use values in their proper units.

6. 6.

   Calculate the net driving torque required for a given mechanism if the effective force on the connecting rod is 50 N and the distance from the crank pivot to the slider pin is 0.2 m.

   Hint

   Remember that torque is a product of force and radius!