Please Note: It may not always be possible to include the necessary special characters, superscripts, subscripts, etc. in e-mail responses to this group of exercises. We suggest that you discuss this matter with your professor/class and decide upon a system for indicating such characters. You may cut/paste some characters and/or Greek letters from Microsoft Word, using the Insert menu. Alternatively, we suggest that you agree upon abbreviations for or spell out symbols, Greek letters, or characters and indicate superscripts and subscripts by using "sup", "sub", or up/down carats.

1			You are standing on a bathroom scale in an elevator. In which of these situations must the scale read the same as when the elevator is at rest? Explain. (a) Moving up at constant speed. (b) Moving up with increasing speed. (c) In free fall (after the elevator cable has snapped).
2			What is the distinction between a vector and a scalar quantity? Give two examples of each.
3			A parked automobile slips out of gear, rolls unattended down a slight incline and then along a level road until it hits a stone wall. Draw a free-body diagram to show the forces acting on the car while it is in contact with the wall.
4			(a) Calculate your weight in newtons. (b) What is the weight in newtons of 250 g of cheese? (c) Name a common object whose weight is about 1 N.
5			A fly fisherman has hooked a Chinook salmon. The salmon is running out the line, moving at a constant velocity of 2 m/s through the water. Identify all the forces acting on the salmon.
6			A car is driving on a straight, level road at constant speed. Draw a free-body diagram for the car, showing the significant forces that act upon it.