When a person wearing a helmet rides a bicycle, the helmet experiences which type of friction? A. Fluid
B. Static
C. Sliding
D. Rolling

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z