10. If the positive direction is toward the right, what is the sign of the force at * = 2 s in Question 9? Explain. tion axis). 11. A toy car can move in either direction along a horizontal line (the + posi- how this gram direc- = 0 s, sume Assume that friction is so small that it can be ignored. A force toward the right of constant magnitude is applied to the car. Sketch on the axes below using a solid line the shape of the acceleration-time graph of the car. V ction Acceleration/ O Time orce at Explain the shape of your graph in terms of the applied force. he dia- and di- In Questions 12-15, assume that friction is so small that it can be ignored. at t = 12. The spring scale in the diagram below reads 10.5 N. ity. As- FA The cart moves toward the right with an acceleration toward the right of 3.25 m/s2. Now two forces are applied to the cart with two different spring scales as shown below. The spring scale FA still reads 10.5 N. F ction 105 LAB 4: COMBINING FORCES ECHANICS