AP Physics 1 Unit 3 Progress Check MCQ Part B Scoring Guide 2023.

AP Physics 1 Unit 3 Progress Check MCQ Part B Scoring Guide 2023.Unit 3 Progress Check: MCQ Part B Page 1 of 30 A horizontal, circular track for running has four lanes, as shown in the figure. Various runners of different masses use the track. In each case, the center of mass of a runner follows a circular path around the track in one of the lanes. 1. Consider a runner in lane 1 with a speed and a runner in lane 4 with a speed , where the ratio of the speeds is . The radius of lane 4 is times the radius of lane 1, and both runners have the same mass. Which of the following claims is correct about the net forces and exerted on the runners in lanes 1 and 4, respectively? AP Physics 1 Scoring Guide Unit 3 Progress Check: MCQ Part B Page 2 of 30 A is equal to . B is equal to . C is equal to . D is equal to . 2. Consider a runner in any of the lanes moving at a known, constant tangential speed. Which of the following measuring tools, if any, could be used to experimentally determine the centripetal acceleration of the runner? A A force probe B A protractor C A meterstick D None of these measuring tools, by themselves, can be used with the known tangential speed to determine the centripetal acceleration of the runner. 3. Now consider four runners running around the track with the same constant tangential speed, with one runner in each lane of the track. A student is considering using the following equations to determine which runner has the greatest acceleration. Equation 1: Equation 2: Which equation should the student use, and why? AP Physics 1 Scoring Guide Unit 3 Progress Check: MCQ Part B Page 3 of 30 A Equation 1, because the runners all have the same speed. B Equation 1, because the different distances traveled by the runners in a complete lap around the track determine which runner has the greatest acceleration. C Equation 2, because the acceleration term has already been isolated on the left-hand side of the equation. D Equation 2, because the radius of the circular path traveled by a runner determines the acceleration of the runner. AP Physics 1 Scoring Guide Unit 3 Progress Check: MCQ Part B Page 4 of 30 4. A truck in a traffic circle travels in a circular path at constant speed while passing through region of the circle, as shown in Figure 1 above. A diagram representing the forces exerted on the truck in region is shown in Figure 2. At a later time a car with less mass than the truck passes through region at the same speed and the same distance from the center of the traffic circle as the truck. The coefficient of friction between the car’s tires and the ground is the same as that for the truck’s tires and the ground. Which of the following diagrams could represent the forces exerted on the car in region compared to the truck in region ? Assume that the length of each arrow is proportional to the magnitude of the force represented by the arrow.