2.2. Calculating Grade Resistance

Try these first

1. 1.

   What is rolling resistance?

   Hint

   Think about what happens as tires move over a surface.

2. 2.

   How do you convert kg to tons?

   Hint

   What is 1000 kg in terms of tons?

3. 3.

   What is the primary factor influencing rolling resistance?

   • Weight of the vehicle
   • Weather conditions
   • Type of tires

   Hint

   Consider what affects how tires roll over a surface.

4. 4.

   Grade resistance decreases when driving downhill.

   • True
   • False

   Hint

   Think about the direction of gravitational force.

5. 5.

   A vehicle weighs 20 tons and has a rolling resistance of 30 kg per ton. If it travels on a 6% slope, calculate the total tractive effort required.

   Hint

   Use the formulas for both rolling and grade resistance, then sum them up.

6. 6.

   If a machine with a maximum rimpull of 9000 kg faces 2000 kg of rolling resistance and 1500 kg of grade resistance, how much effective pull does it have left?

   Hint

   Calculate total resistance then subtract it from maximum rimpull.