This lab uses three friction carts with different surfaces onthe bottom (cork, felt, and Teflon) and a set of masses totaling1250 g. The carts are pulled with a piece of string attached to ahook on a force sensor, which measures the force of tension in thestring. Behind the cart being pulled is a motion sensor. These twodevices are used to display and record the string tension and thevelocity of the cart as a function of time, with a 20 Hz(measurements per second) sampling rate. The main use for thevelocity vs. time graph is to allow the person pulling the cart tomake sure that, once the cart starts to move, they are pulling thecart with the constant force required to maintain a constantvelocity.
Before the cart starts moving, what is the net force on it? Howis the (horizontal) string tension force acting on the cart relatedto the friction force acting on the cart?
When the cart is moving with a constant velocity, what is thenet force on it? How is the (horizontal) string tension forceacting on the cart related to the friction force acting on thecart?
