Question

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is A) static friction. B) kinetic friction. C) a combination of static and kinetic friction. D) neither static nor kinetic friction but some other type of friction. E) It is impossible to tell what type of friction acts in this situation. A car of mass m goes around a banked curve of radius r with speed v. Draw a free-body diagram for the car. If the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to A) mg/2. B) mg sin theta. c) mv2/r. D) mg. E) tanlv^2/(rg)]. A ball is lied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 0.700 revolutions per second. What is the centripetal acceleration of the ball? A) 14.8 m/s B) 67.9 m/s C)38.7m/s^2 D) 74.2 m/s E) 29.3 m/s

Answer 1

6) neither static nor kinetic it is a rolling friction

7)

FNcos8 FN R. mg mg

8) for the given options 38.7 m/s^2 is only the acceleration remaining all are velocities