Mechanics Questions 1, Winter 2018 Please read carefully and answer properly Question Title * 1. Your Name: Question Title A sled on ice moves in the ways described in the next three questions. Friction is so small that it can be ignored. A person wearing spiked shoes standing on the ice can apply a force to the sled and push it along the ice. Choose the one force (A through G) which would keep the sled moving as described in each statement below. Answer choice J if you think that none is correct. Question Title * 2. Which force would keep the sled moving toward the right and speeding up at a steady rate (constant acceleration)? A B C D E F G J Question Title * 3. Which force would keep the sled moving toward the right at a steady (constant) velocity? A B C D E F G J Question Title * 4. The sled is slowing down at a steady rate and has an acceleration to the right. Which force would account for this motion? A B C D E F G J Question Title The next three questions refer to a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Use one of the following choices (A through G) to indicate the force acting on the coin for each of the cases described below. Answer choice J if you think that none is correct. Ignore any effects of air resistance. Question Title * 5. The coin is moving upward after it is released. A B C D E F G J Question Title * 6. The coin is at its highest point. A B C D E F G J Question Title * 7. The coin is moving downward. A B C D E F G J Question Title The questions below refer to collisions between a car and truck. For each description of a collision, choose the one answer from the possibilities (A though J) that best describes the forces between the car and the truck. Question Title Truck is much heavier than the car Question Title * 8. They are both moving at the same speed when they collide. Which choice describes the forces? A B C D E F J Question Title * 9. The car is moving much faster than the heavier truck when they collide. Which choice describes the forces? A B C D E F J Question Title Use this figure for the following questions. Question Title * 10. The sled is pulled up a steeper hill of the same height as the hill described above. How will the velocity of the sled at the bottom of the hill (after it has slid down) compare to that of the sled at the bottom of the original hill? Choose the best answer below. The speed at the bottom is greater for the steeper hill. The speed at the bottom is the same for both hills. The speed at the bottom is greater for the original hill because the sled travels further. There is not enough information given to say which speed at the bottom is faster. None of these descriptions is correct. Question Title * 11. The sled is pulled up a higher hill that is less steep than the original hill described above. How does the speed of the sled at the bottom of the hill (after it has slid down) compare to that of the sled at the bottom of the original hill? The speed at the bottom is greater for the higher but less steep hill than for the original. The speed at the bottom is the same for both hills. The speed at the bottom is greater for the original hill. There is not enough information given to say which speed at the bottom is faster. None of these descriptions is correct. Done