Rolling friction isa)greater than or equal to staticb)greater than static frictionc)equal to static frictiond)less than static frictionCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Rolling friction is always less than static friction because in order for an object to roll the force of friction between it and surface must be large enough to keep the object from sliding. Hence rolling friction is always greater than static force.

Answer

Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation of the wheel, roadbed, etc. is recovered when the pressure is removed.

Answer

Explanation:

Rolling friction is the resistance to motion experienced by a rolling object when it moves over a surface. It occurs when an object rolls on a surface, such as a wheel rolling on the ground.

Comparison between rolling friction and static friction:

Static friction is the force that prevents an object from moving when a force is applied to it. It acts in the opposite direction to the applied force and keeps the object in equilibrium. It is generally greater than rolling friction.

Rolling friction is the force that opposes the motion of a rolling object. It is generally less than static friction.

Reason why rolling friction is less than static friction:

Rolling friction is less than static friction because when an object rolls, only a small portion of its surface comes into contact with the surface it rolls on. This reduces the amount of frictional force acting on the object. The rolling motion also helps in reducing friction as the object is not sliding or dragging along the surface.

When an object is at rest, the entire surface comes into contact with the surface it rests on, resulting in a higher frictional force. This is why static friction is generally greater than rolling friction.

Example:

To understand this concept better, consider the example of a car moving on a road. When the car is at rest, static friction comes into play, which allows the tires to grip the road and prevent the car from sliding. As the car starts moving and the tires begin to roll, rolling friction takes over, which is less than static friction.

Conclusion:

In conclusion, rolling friction is less than static friction because only a small portion of the surface of a rolling object comes into contact with the surface it rolls on, reducing the frictional force. This is why rolling friction is generally less than static friction.

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