04 Complete.rtf - SPH4U Lesson Assignment 4 In this...

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SPH4U Lesson Assignment 4 In this assignment you are going to focus on: Forces and Body Free Diagrams. Total Marks: 62 marks Instructions: After completing the lesson action section of your home page, you are ready to complete your lesson assignment. Follow these steps: a) In the textbox given, explain the strategy that you used to determine your answer. b) Fill in your answer. The mark for each question is given at the introduction to the questions to be completed. c) When finished answering all your questions, save your file and upload the file into the appropriate dropbox. Part A (Force Concepts): True or False (10 marks ) using your knowledge & understanding, consider each statement, and decide if it is true in all cases, or may be false. Along with your statement of true or false, include a reason for your decision. Each question is worth 2 marks. - one for the matching and one mark for your reason. ____ 1. The normal force that acts on an object is always equal in magnitude and opposite in direction to the gravitational force that is acting on it. _________________________ False. It can be true in cases where surface on which object is present is horizontal. But in case the surface is tilted then normal force will not be equal in magnitude and opposite in direction to F g . ____ 2. Forces of tension always act vertically upward . ______________________________ False. It is true in cases where an object is suspended vertically by means of some cable but not in all cases. E.g. ab object being pulled by a rope at 45 degrees with the horizontal. ____ 3. Friction alwaysacts against an object’s motion relative to the contact surface. _________________________True. Frictional force is parallel to the contact surface and opposite to the direction of motion. ____4.Free body diagrams include all the forces acting on the object, not just those directly responsible for the object’s motion. ______________________________True. Free body diagrams include all the forces and moments acting on the object.____5.When forces acting on an object are in equilibrium, the object can still be moving. _________________________True. Because there is no net force acting on an object in equilibrium, then from Newton's first law of mo-tion, an object at rest will stay at rest, and an object in motion will stay in motion.SPH4U1 Lesson AssignmentPage 1
SPH4U1 Lesson Assignment Page 2
Part B ( Forces): Multiple Choice: ( 32 marks) each question is worth 2 marks.

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