Contacts are things u put on our eyes to help you see better i use them and they dont hurt. Remember if you cant see right you need to see your aye doctor
Contact Forces are those forces that occur do to a physical interaction between two objects where the objects touch each other. an example is the frictional force that occurs between any two surfaces...
A non-contact force is any force applied to an object by another body that is not in direct contact with it. The most common example of a non-contact force is gravity. A non-contact force is...