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Questions and Answers
What is the phenomenon called when the outer portion of a road is raised more than the inner portion?
What is the phenomenon called when the outer portion of a road is raised more than the inner portion?
Banking of track
What is the angle through which the outer edge of a curved road is raised above the inner edge called?
What is the angle through which the outer edge of a curved road is raised above the inner edge called?
Angle of banking
What equation gives the expression of the angle of banking on a road?
What equation gives the expression of the angle of banking on a road?
tan θ = v²/rg
What are the advantages of banking of track? (Select all that apply)
What are the advantages of banking of track? (Select all that apply)
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Study Notes
Banking of Track
- On a curved road, the outer portion is raised more than the inner portion to reduce friction and wear on tyres.
- This phenomenon is called banking of track, applied to roads and railway tracks.
Angle of Banking
- The angle of banking is the angle through which the outer edge of the curved road is raised above the inner edge.
- The angle of banking (θ) is related to the speed (v) and radius (r) of the curved path.
Equilibrium of a Vehicle
- The normal reaction (R) exerted by the ground makes an angle θ with the vertical, with two components: R cos θ (balancing weight) and R sin θ (providing centripetal force).
- The equations for equilibrium are R cos θ = mg and R sin θ = mv2/r.
Expression of Angle of Banking
- The expression for the angle of banking is tan θ = v2/rg, which shows the road is banked.
- The equation can be rewritten as v = √(rg tan θ), giving the speed at which a vehicle can negotiate a circular road banked at angle θ.
Maximum Speed and Friction
- For maximum speed, tan θ = 1 and v = √(rg).
- The angle θ depends on speed and radius, but not on the mass of the vehicle.
- If the speed is too high, even maximum friction cannot prevent a skid or slip.
Advantages of Banking of Track
- Provides necessary centripetal force.
- Reduces frictional wear and tear of tyres.
- Avoids skidding.
- Avoids overturning of vehicles.
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Description
Understanding the concept of banking of track, angle of banking, and equilibrium of a vehicle on curved roads and railway tracks.