Final answer:
The primary forces acting on the tires as children play with them are friction, contact forces, and gravitational forces.
Explanation:
Friction is the primary force acting on the tires as children play with them. When the children climb, jump, or hide in the tractor tires, contact forces also come into play, ensuring they remain on or inside the tires. Additionally, there might be gravitational forces involved as the tires interact with the ground.
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