What are contact forces? Give an example of a contact force. What is the difference between applied force and normal force?
HELP ASAP I NEED TO KNOW THE ANSWERS PLEASE ALSO GIVE AN EXAMPLE FOR THE FIRST QUESTION!!!

Altocumulus, altostratus, cirrocumuls, cirrostratus, cirrus, cumulonimbus, cumulus, nimbostratus, stratocumulus, stratus 8.) clouds with tallest vertical development 9.) low altitude clouds in solid layers that produce rain 10.) high altitude thin flat layers of clouds 11.) rain clouds that form under stable atmospheric conditions 12.) middle altitude clouds with globular appearance