1 Physics 20: SUMMER Assignment 6 136 Assignment 6 Unit B Module 1, Lesson 4: Free-Body Diagrams and Net Force Lesson 1 of this assignment is worth 9 marks. The value of each question is noted in the left margin in parentheses. Remember: all net force problems should include a free-body diagram. 1. Beta convinces Alpha to drag their ice-fishing shack to a new location by pulling it with ropes. Alpha applies a force of 150 N [175*] on one rope and Beta applies a force of 175 N [190*] on another rope. What is the net force applied to the shack by Alpha and Beta? Assume the ice is frictionless. Show all work. (6)2 Physics 20: SUMMER Assignment 6 2. The next day, Alpha decides to move the shack back to its original location. Alpha (having had a nutritious breakfast) is able to pull the 1800 kg shack at a constant velocity with a force of 190 N. Calculate the coefficient of friction between the shack and the ice. Show all work. (3)After you have completed all questions in Lesson 4, please place your assignment in a safe place until you have finished Lesson 5. Unit B Module 1, Lesson 5: Solving Net Force Problems Lesson 2 of this assignment is worth 27 marks. The value of each question is noted in the left margin in parentheses. Remember: all net force problems should include a free-body diagram and specify positive and negative directions. . 3. A textbook with a mass of 2.18 kg is pulled across a table with a horizontal force of 5.5 N [E]. If the table has a coefficient of friction of 0.15, what is the acceleration of the textbook? (2)Physics 20: SUMMER Assignment 6 4. Use the following information to answer parts a and b. A 10.0 kg toboggan slides down a frictionless icy hill with a slope of 25.0'. a) Calculate the parallel component of the toboggan's weight. (2) b) Calculate the acceleration of the toboggan. (1)5. Use the following information to answer parts a and b. A 7.5 kg crate is placed on a ramp that is at an angle of 30.0 relative to the horizontal. a) What is the force of friction required for the crate to remain stationary? (2) @ADLC All Rights Reserved (2022) 4 Physics 20: SUMMER Assignment 6 b) What is the static coefficient of friction necessary for the crate to remain stationary? (1)6. A roofer pulls a 25.0 kg bundle of shingles up the side of a roof that has a 29.0" pitch. She applies a force to the shingles, counteracting the 18.5 N of friction, to accelerate the shingles at a rate of 0.50 m/s'. Calculate the force she applied to the shingles. (4)Physics 20: SUMMER Assignment 6 7. Use the following information to answer the following question. You may want to reference the page "Simple Pulleys" (Lesson 5 Page 8) from your course for this question. A student sets up a Fletcher's Trolley, where Block 1, on the table, has a mass of 0.450 kg and Block 2, suspended off the side of the table, has a mass of 0.766 kg. Assume the mass of the rope and friction are negligible. Calculate the acceleration of the system. Show all work starting with free- body diagrams and net force equations for each block. (4)8. Fill in the blanks with the terms "greater than", "less than", or "equal to" to outline how the normal force applied by the elevator, and therefore, your apparent weight, changes as you travel in an elevator. a) Your apparent weight is your actual weight when the elevator travels at a constant speed/coasts. (3) b) Your apparent weight is your actual weight when the elevator accelerates downward. c) Your apparent weight is your actual weight when the elevator is moving upward and slows down to stop at a floor. @ ADLC All Rights Reserved (2022)Physics 20: SUMMER Assignment b 9. During a rocket launch, an astronaut experiences a "g-force" (actually an acceleration) of 3.0 gs [upward], which is equal to three times the acceleration due to gravity. If the astronaut weighs 79.4 kg, what is her apparent weight during the acceleration? (2) 10. When the astronaut enters the ISS (International Space Station), she is in "free fall," where the only force acting on her is the force of gravity applied by the Earth. What happens to her true weight and her apparent weight as she enters the ISS? Explain. (You may want to reference p. 227-228 of the textbook to help you.)Physics 20: SUMMER Assignment 6 11. What is the mass of a person accelerating downward at -5.45 m/s if they are standing on a scale that reads 236 N? (2) 12. While traveling at constant speed in an airplane, a passenger's weight is 750 N. When the airplane accelerates downwards, his apparent weight is 672 N. What was the acceleration of the airplane? (2)