K/UT/I(d) Use your results from Part A to plot a graph of net force (y-axis) versus acceleration (x-axis). Draw a line of best it and calculate its slope. What does this graph indicate about the relationship between acceleration and net force? What does the slope represent?T/IC(e) Use your results from Part B to plot a graph of acceleration (y-axis) versus total mass (x-axis). Draw a smooth curve through the points. What does this graph indicate about the relationship between acceleration and total mass?T/IC(f) Use your results from Part B to plot a graph of acceleration (y-axis) versus the reciprocal of the total mass (1/m; x-axis). Draw a line of best it and calculate its slope. What does this graph indicate about the relationship between acceleration and total mass? What does the slope represent?T/IC(g) Answer the Testable Questions.T/I(h) Comment on the accuracy of your hypothesis.C(i) List some possible sources of error. How could you modify the investigation to avoid or reduce these sources of error?T/IApply and Extend(j) Describe how you could determine if friction had any efect on the results of this investigation.T/I(k) Explain why a graph of net force versus acceleration must pass through the origin when the total mass is constant.T/I(l) Explain why a graph of acceleration versus the reciprocal of the total mass must pass through the origin when net force is constant.T/I(m) Commercial airlines are limiting the number of pieces and the mass of luggage that passengers can bring onto an aircrat. Use what you have learned in this investigation to explain why.CAChapter 3 Investigations151NEL

KEY CONCEPTSAfter completing this chapter you will be able to• distinguish between different types of forces and describe how they affect the velocity and acceleration of an object• explain how Galileo and Newton advanced our knowledge of forces and motion• state and apply Newton’s laws qualitatively• use free-body diagrams to calculate net force and acceleration• solve problems involving forces in one dimension using free-body diagrams and Newton’s laws• conduct an inquiry into the relationship among the acceleration, net force, and mass of an object, and analyze the resulting data• assess the environmental and social impact of technologies that involve forcesWhat Effect Do Forces Have on the Motion of Objects?he skier on the opposite page has many diferent forces acting on him at the same time. Each force has an efect on his motion. he ground exerts forces on the skier, gravity is pulling on him, and even the air is pushing him back. When you combine all of these forces, you can determine how the skier will move. At times, the skier will move with a constant velocity, while at other times he will speed up or slow down. he sum of all the forces acting on the skier determines which of these will occur.

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