2.2. Outline of Today's Presentation

Try these first

1. 1.

   Name one basic step in earthmoving operations.

   Hint

   Think about what happens before digging.

2. 2.

   What is haul distance?

   Hint

   Consider how far you need to move the earth.

3. 3.

   What is the economic haul distance for a bulldozer?

   • 50 meters
   • 100 meters
   • 150 meters

   Hint

   Consider the information provided about bulldozer efficiency.

4. 4.

   True or False: Grade resistance only occurs when moving downhill.

   • True
   • False

   Hint

   Think about how machines perform on different slopes.

5. 5.

   Calculate the total tractive effort for a bulldozer with a gross weight of 25 tons on a poorly maintained earthen road, given a rolling resistance of 75 kg/ton and a 4 cm penetration.

   Hint

   Consider both the base rolling resistance and the additional effort due to sinking.

6. 6.

   Design a small experiment to compare the actual power consumption of two types of earthmoving equipment over a fixed distance of 100 meters.

   Hint

   Think about controlling variables to ensure a fair test.