8.4. Components of Rolling Resistance

Try these first

1. 1.

   What is rolling resistance?

   Hint

   Think about the units commonly associated with moving machinery.

2. 2.

   What are the two components of rolling resistance?

   Hint

   Consider how each arises during operation.

3. 3.

   What is the primary component of rolling resistance that relates to the type of surface?

   • Surface Resistance
   • Penetration Resistance
   • Tractive Effort

   Hint

   Think about what directly affects the wheel contact.

4. 4.

   True or False: Higher inflation pressure in narrow tires is beneficial for soft surfaces.

   • True
   • False

   Hint

   Consider why tires sink.

5. 5.

   A construction equipment weighing 70,000 kg operates on a poorly maintained earthen road. The rolling resistance is 90 kg per ton. Calculate the total rolling resistance and discuss the strategies to minimize this.

   Hint

   Think about both calculation and operational strategies.

6. 6.

   A track-loader handling 40 tons has a low rolling resistance of 25 kg per ton when operating on a well-maintained surface. What would be the total tractive effort required, and how could this change on a soft, uneven surface?

   Hint

   Consider the factors affecting resistance on varying surfaces.