Friction Cards

Description: Physics is f=uN (fun!), perfect for student, teacher, science and nerd gifts. f=mu*N is the common expression to calculate the force of friction, and conveniently spells out exactly what physics is: fun! We hope you agree :)

Description: This graphic is inspired by my longtime loves of science and rock climbing. The equations and critters depict the three principal physical requirements for a successful climb: tensile strength, shown by a generic stress-strain curve; force; and maximum static friction.

Description: An illustration of a rock climbing hitch called the autoblock or third hand.

Description: 109. Nature's laws enforce themselves.

Description: Topical t-shirt: dead extra number two

Description: You're a fascinating specimen, Robert. If you know... you know!