Chapter 2.1, Problem 1dT

There are many different types of forces, including: friction $\left(\stackrel{\to }{f}\right)$ , tension $\left(\stackrel{\to }{T}\right)$ , magnetic forces $\left({\stackrel{\to }{F}}^{\text{mag}}\right)$ , normal forces $\left(\stackrel{\to }{N}\right)$ , and the gravitational force ( $\stackrel{\to }{W}$ , for weight). Categorize these forces according to whether they are contact or non-contact forces.
Contact forces  Non-contact forces