Iron-rich mineral in rock pointed in one direction and then switched to the exact opposite direction. this supports what idea?

Abearing is designed to a reduce friction b. support a load c.guide moving parts such as wheels, shafts and pivots d. all of the above

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?