Physics 1: Exam 1 Questions & Answers

Physics 1: Exam 1 Questions & Answers A "force" could be best described as a) something one body does to another body that can cause the second body to accelerate b) something one body does to another body that keeps the second body moving c) something that a body possesses, that enables it to do work d) something that a body possesses, that enables it to keep moving - ANSWER: a) something one body does to another body that can cause the second body to accelerate A 1-kg rock that weighs 10 N is thrown straight upward at 20 m/s. Neglecting air resistance, the net force that acts on it when it is halfway to the top of its path is a) more than 10 N b) 10 N c) less than 10 N - ANSWER: b) 10 N A 10-N falling object encounters 4 N of air resistance. The net force on the object is a) 0 N b) 4 N c) 6 N d) 10 N e) none of the above - ANSWER: c) 6 N A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision: a) the car and the truck have the same magnitude acceleration b) the force on the truck due to the collision is slightly greater than the force on the car c) the force on the truck due to the collision is exactly equal to the force on the car d) the force on the car due to the collision is much greater than the force on the truck - ANSWER: c) the force on the truck due to the collision is exactly equal to the force on the car A bag of groceries that has a mass of 10 kilograms weighs about a) 1000 N b) 100 N c) greater than 1000 N d) 10 N e) 1 N - ANSWER: b) 100 N A ball is rolling along the floor. It is rolling toward the East, and slowing down as it rolls. As the ball rolls a) its velocity is toward the west b) both of the above c) the net force on it is toward the west d) the net force on it is toward the east - ANSWER: c) the net force on it is toward the west A ball is thrown up into the air. Ignore air resistance. When it is rising and reaches half of its maximum height, the net force acting on it is a) greater than its weight b) equal to its weight c) zero N d) less than its weight, but not zero N - ANSWER: b) equal to its weight A ball is tossed vertically upward. When it reaches its highest point (before falling back downward):