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Unformatted text preview: -- Part 1: Circle the correct answer. Each is worth 5 points. 1. It takes no force to accelerate a piece of string that connects two masses. TRUE 2. If an object is sliding down a slope, there is at least one direction you can pick in which the net force is zero. ~ ~ FALSE 3. In a modified Atwood machine (block on a ramp connected by string and pulley to a hanging mass), if you decide that the acceleration of the block is positive when it moves right towards the pulley, what should you pick as the positive direction of acceleration for the hanging mass? B.Up C.Left D. Right E. It doesn't matter. 4. If an object is submerged in fluid, where is the pressure the greatest? A. The top of the object ~. The bottom of the object C. It's the same over the entire object D. It depends on the shape of the object 5. A sharp knife is safer than a dull one because you don 't need to apply as much force to get the same pressure, making the knife easier to control. FALSE 6. If you push on a shopping cart with 40N of force, the cart pushes back on your hands with less force , because it weighs a lot less than you_do. TRUE 7. If an object is sliding downhill, which force is at least partly in the direction of "uphill"? " A. Weight B. Normal force @ Friction D. All of the above 8. What is a possible reason for the fact it's hard to move quickly underwater?...
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