Static and Kinetic Friction-NEED HELP!!
1.) What would be the acceleration of a 19 kg aluminum block if it were being pulled with a horizontal applied force of 300 N?
2.) In moving a 35..0kg desk from one side of a classroom to the other, a teacher finds that a horizontal force of 275 N is necessary to set the desk in motion and force of 195N is necessary to keep it in motion with constant velocity. What are the coefficients of (a) static friction and (b) kinetic friction between the desk and the floor?
3.) A 40kg crate is at rest on a level surface. If the coefficient of static friction between the crate and the floor is 0.69, what horizontal force is required to move the crate.
These problems I know how to do them but I get stuck...