Seth wants to drag a 20.0 kg. sled over a flat field.  He pulls on the rope horizontally, and the coefficient of friction is 0.60.     With what force must Seth pull to keep the sled moving with a constant velocity? With what force must Seth pull to give the sled an acceleration of 2.0 m/s2?

I watched a lot of Looney Toons when I was a kid, and liked that the Roadrunners legs would spin for a second or two before their claws caught traction. a. With a coefficient of kinetic friction 0.2 what acceleration will the roadrunner experience while their feet are sliding accross the ground? b. How far forward will the roadrunner drift in a half second, starting from rest under this acceleration? c. After catching traction the Roadrunner accelerates away, travelling 10 m to get offscreen in one fifth of a second. What was their coefficient of static friction?

Nick is pulling a 20 kg crate across a horizontal floor with a rope angled 30° above the horizontal. The coefficients of kinetic and static friction are 0.2 and 0.3, respectively. If the crate is moving at a constant speed, what is the tension in the rope?

Two masses of weight 30.0 NN are suspended at opposite ends of a rope that passes over a light, frictionless pulley. The pulley is attached to a chain that goes to the ceiling. What is the tension in the rope? What is the tension in the chain?