CONCEPTUAL Physics- NEXT-TIME QUESTION 6). A marble rolling on a horizontal surface encounters an incline and rolls up it without skidding until it comes to a stop. Then it rolls back down again, also without skidding. The force on the marble due to its interaction with the incline has two components-one perpendicular to the incline (the normal force) and one parallel to the incline (a frictional force). The frictional force on the marble is directed down the incline for the upward roll and up the incline for the downward roll. b) up the incline for the upward roll and down the incline for the downward roll. up the incline for the entire trip. down the incline for the entire trip. c) d) Consider sliding on a slippery slope vs rolling!

CONCEPTUAL Physics- NEXT-TIME QUESTION 6). A marble rolling on a horizontal surface encounters an incline and rolls up it without skidding until it comes to a stop. Then it rolls back down again, also without skidding. The force on the marble due to its interaction with the incline has two components-one perpendicular to the incline (the normal force) and one parallel to the incline (a frictional force). The frictional force on the marble is directed down the incline for the upward roll and up the incline for the downward roll. b) up the incline for the upward roll and down the incline for the downward roll. up the incline for the entire trip. down the incline for the entire trip. c) d) Consider sliding on a slippery slope vs rolling!