. In the lab room, you are sitting in an office chair with wheels while holding onto a force sensor, and the chair is at rest. One end of a lightweight string is attached to the force sensor, and your lab partner is holding the other end of the string. Your lab partner then moves away from you, pulling on the string. Describe how your lab partner must move for the force sensor to read a constant force. Explain. Question Pre-2. A cart is at rest on a horizontal track. You hold down the cart, and your lab partner attaches one end of a lightweight string to the cart. Your lab partner passes the string over a pulley and hangs a mass on the other end of the string. Your lab partner releases the hanging mass, and the hanging mass is suspended vertically at rest. You then release the cart. a) Draw a picture of this situation.