Directions: Study each situation described below. Show your complete solutions with corresponding free-body diagrams. Levels of Performance Competency Advanced Proficient Developing Intervention Required LCI. Construct free- Student demonstrates Student demonstrates Student demonstrates Student demonstrates body diagrams to STRONG evidence of SUFFICIENT LIMITED evidence LACK of mastery and analyze forces acting mastery and evidence of mastery of mastery and understanding by on a body understanding by and understanding by understanding by inability to identify predicting net force constructing complete creating free-body forces that make up a and motion of objects free-body diagrams of diagrams with missing free-body diagram based on objects to explain force vectors and comprehensive free- motion. The free-body incomplete labels. body diagrams. diagrams are Accurate calculations supported by accurate support the prediction calculations. of motion of objects. 1. A car broke down in the middle of a sandy road. The owner contacted you as the owner of a towing company to help with 3 towing cables. Find a position to attach each of the 3 cables to the car and make it move with constant velocity. The top view of the car is shown in the image. HOTS 2. A wooden block rests on top of an inclined plane with enough friction to prevent it from sliding down. To start the block moving, is it easier to push it up along the plane or push it down? Why? (Create a free-body diagram of each option to support your answer.)II. Work from Force-Position Graphs Directions: Study the force-position graph below and answer each question that follow. You will be graded based on the rubrics provided below. Levels of Performance Competency Advanced Proficient Developing Intervention Required LCI. Evaluate work Student demonstrates Student demonstrates Student demonstrates Student demonstrates done from force STRONG evidence of SUFFICIENT LIMITED evidence LACK of mastery and position graphs musicry and evidence of mastery of mastery and understanding by understanding by and understanding by understanding by inability to understand extracting and accurately interpreting defining the and obtain interpolaling correct information from a information information from information from a force-position graph. obtainable from force-position graphs. force-position graph. Connects the graph to force-position graph Provides an accurate similar application of scenarios graph by describing actual physical socmarios. 10 B 4 2 Fx (N) o -2 -4 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 x (m) Basic 3. Identify the segments where work done is positive and where work done is negative. On- 4. Assume that the graph is measured from a small vehicle with mass m = 313 kg. What is the Level work done by the vehicle between: (a) Om and 5m, (b) om and 10m, and (c) 8m and 15m? HOTS 5. What real-life situation can be described by the force-position graph above? Include a brief explanation why.6. You throw an 20 N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 - upward. Use the work-energy theorem to find (a) the rock's speed just as it left the ground and (b) its maximum height. On- 7. A 75 kg roofer climbs a vertical 7.0 m ladder to the flat roof of a house. He then walks 12 m Level on the roof, climbs down another vertical 7.0 m ladder, and finally walks on the ground back to his starting point. How much work is done on him by gravity (a) as he climbs up; (b) as he climbs down; (c) as he walks on the roof and the ground? (d) What is the total work done on him by gravity during this round trip? HOTS 8. Calculate the change in Potential Energy of the roofer in (a), (b), and (c) from #5. Compare the changes in Potential Energy with the roofer's Work done in each instance.9. You often hear that most of our energy ultimately comes from the sun. Trace each of the On- following energies back to the sun: (a) the kinetic energy of a jet plane; (b) the potential energy Level gained by a mountain climber; (c) the electrical energy used to run a computer; (d) the electrical energy from a hydroelectric power plant. 10. A rock of mass m and another rock of mass 2m are both released from rest at the same height and feel no air resistance as they fall. Argue whether cach statement below is true or false. a. Both have the same initial gravitational potential energy b. Both have the same kinetic energy when they reach the ground HOTS c. Both reach the ground with the same speed d. When it reaches the ground, the heavier rock has twice the kinetic energy of the lighter one e. When it reaches the ground, the heavier rock has four times the kinetic energy of the lighter one