Materiallar qarshiligi

*ko‘ndalang kesimning normaliga parallel yo‘nalgan kuchlanish	ko‘ndalang kesimning normaliga tik yo‘nalgan kuchlanish	ko‘ndalang kesimning normaliga parallel yo‘nalgan kuch	ko‘ndalang kesimning normaliga tik yo‘nalgan kuch
	Qanday kuchlanish urinma kuchlanish deyiladi?	*ko‘ndalang kesimning yuziga parallel yo‘nalgan kuchlanish	ko‘ndalang kesimning yuziga tik yo‘nalgan ko‘chlanish	ko‘ndalang kesimning yuziga parallel yo‘nalgan kuch	ko‘ndalang kesimning yuziga tik yo‘nalgan kuch
	Urinma kuchlanish qanday belgilanadi ?	*τ	σ	δ	ψ
	Normal kuchlanish qanday belgilanadi ?	* σ	τ	δ	ψ
	Qiya tekislikda normal kuchlanish qanday aniqlanadi?	*