Problem 2: An applied force of 20 N is used to accelerate an object to the right across a frictional surface. The object encounters 10 N of friction. Use the diagram to determine the normal force, the net force, the coefficient of friction (1) between the object and the surface, the mass, and the acceleration of the object. (Neglect air resistance.) Fnorm Frriet"10 N Fapp = 2 Fgrav100 N m Fnet

m = 8 kg v0 = 6 m/s F = 12 N the box reaches 10 m in 1.4 seconds If you wanted the box to reach a distance of x = 10 m in 0.761 seconds, to what value would you change the force (in N)?

A skater with an initial speed of 8.10 m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible.(a) The coefficient of kinetic friction between the ice and the skate blades is 0.135. Find the deceleration caused by kinetic friction.(b) How far will the skater travel before coming to rest? a =                                                             + -      units                                                       x =           units

0.350 and 0.480. Vehicles of all types travel on the road, from small VW bugs weighing 1110 lb to large trucks weighing 7650 lb. Considering that some drivers will brake properly when slowing down and others will skid to stop, calculate the minimum and maximum braking distance needed to ensure that all vehicles traveling at the posted speed limit can stop before reaching the intersection. minimum braking distance: ft maximum braking distance: ft Given that the goal is to allow all vehicles to come safely to a stop before reaching the intersection, calculate the maximum desired speed limit. maximum speed limit: mph Which factors affect the soundness of your decision? Precipitation from the fog can lower the coefficients of friction. Drivers cannot be expected to obey the posted speed limit. Reaction time of the drivers is not taken into account. Newton's second law does not apply to this situation.