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Classify the following situation into contact and noncontact forces.
The speed of a ball rolling on ground is reduced.
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Contact forces are ones which require a physical contact between the objects, on which it is being acted upon.
In the given case, the speed of a ball rolling on ground is reduced due to frictional force.
Frictional force is a contact force, as it is exerted by a surface against the motion of a body across its surface.
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