Please Help 3 4 and 5
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3. Contact forces act only when the interacting bodies are in physical contact.
The origin of contact force is electromagnetic interaction.
They generally don't depend upon the surfaces in contact.
4. We can push using string
5. Pull. Because when you push there is one component of force that adds to the weight of the body and hence there is more friction. When you pull the vertical component of force is against the weight of the body and hence there is overall less friction. So it is easy to pull than push an object.
The origin of contact force is electromagnetic interaction.
They generally don't depend upon the surfaces in contact.
4. We can push using string
5. Pull. Because when you push there is one component of force that adds to the weight of the body and hence there is more friction. When you pull the vertical component of force is against the weight of the body and hence there is overall less friction. So it is easy to pull than push an object.
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