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3 cards from this section. Quick, good the night before a test.
Define rolling resistance.
Think about how tires interact with different surfaces.
What factor greatly reduces rolling resistance on a hard surface?
Consider what keeps tires from sinking or dragging.
What is rolling resistance driven by?
Think about what happens when machines roll on softer surfaces.
True or False: Higher tire pressure on a soft surface reduces rolling resistance.
Consider how tires behave differently on hard vs. soft surfaces.
A construction vehicle with a gross weight of 40,000 kg is moving on a gravel road with a rolling resistance of 90 kg per ton. If the vehicle sinks 4 cm into the ground, calculate the total tractive effort required.
Break down the rolling resistance into weight and penetration force.
Discuss how machinery would operate differently on a wet, muddy road compared to a dry, firm surface. What implications does this have for estimated power requirements?
Consider factors like rolling and penetration resistance in context.
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