Are tires designed to increase rolling friction and decrease sliding friction?

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

The heliocentric and the geocentric models of the solar system included these central principles

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?