Question

When a coach with steel wheel is pushed to roll on steel rails, it travels much more distan
than what a similar coach with rubber tires does when pushed with the same force on a
The rolling friction in the first case is far lesser than in the second case. Why?
a) Deformity of rubber tyres brings in additional sliding friction
bi Because of additional fluid friction due to air pressure of rubber tyres
c) Rubber tyres increase the resistive force
d) Rolling friction is in the direction of motion in the first case and in opposite direction
second case​

Answer 1

You are doing the science objective exam from st.peter's convent online class 8

Answer 2

The correct solution to the given question is option c: Rubber tires increase the resistive force.

• When two surfaces make contact with each other, the force of friction is created, which opposes the mobility of either object.
• Because the surface is smooth, there is less friction between steel tires and steel rails. It will then move more smoothly for a longer distance.
• Because of the rough nature of rubber, there will be a lot of friction between the wheel and the rails in the case of rubber tires. When the external force is removed, the rubber tire will stop moving after a short distance.
• As a result, because rubber tires enhance the resistive force, rolling friction in the first scenario is much lower than in the second.