Which contact force always acts against the direction of movement?

What were some of the most important native items adopted by europeans ? what impact did they have on european life ?

Is the weather changing? consider the data of severe weather that includes tornadoes occurring throughout the u. s. over the last four years. compare the severe weather for the last three years. then compare the first three months of 2017 with that data. based on previous years, what might the prediction be for weather during 2017?

Why would employers want there to be large numbers of unemployed workers around?