Question

which one is easy to roll a wooden block or to slide a wooden block justify your answer​

Answer 1

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Rolling a wooden block is much easier than sliding a wooden block.

When an object rolls over the surface of another object ,the resistance to its motion is called rolling friction. It is always easier to roll than to slide an object over another object.So rolling friction is much less than the sliding friction.

Sliding friction occurs when one surface is rubbing against another surface, whereas rolling friction occurs when an object is rolling on another surface. Rolling friction is easier than sliding friction due to less frictional force.

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Sliding Friction:

The term sliding friction refers to the resistance created by two objects sliding against each other. This can also be called kinetic friction. Sliding friction is intended to stop an object from moving.

The amount of sliding friction created by objects is expressed as a coefficient which takes into consideration the various factors that can affect the level of friction. These various factors that can impact sliding friction include the following:

The surface deformation of objects

• The roughness/smoothness of the surface of the objeects
• The original speed of either object
• The size of object
• The amount of pressure on either object
• The adhesion of the surface.

Rolling Friction:

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.

The amount of friction created by a rolling object is less than the friction created by normal force. It is dramatically less than other types of friction, such as sliding friction.

The actual rolling friction can be measured and expressed as a number multiplied by the normal force.

There are various factors that can affect rolling friction such as:

• Shape of wheel
• The type of surface on which the wheel is rolling
• Any movement of the surface or below the surface
• Original speed of the wheel
• Diameter of the wheel
• Amount of pressure on the wheel
• Adhesion of the surface
• Any amount of sliding that occurs in addition to the rolling motion
• Deformation of object or of surface
• Over inflation of tires
• Micro-sliding
• Thickness of tread on tires
• Shape of tread on tires
• Material that wheel or ball is made of

Hope this helps you mate and✌