Unit 3: Assessment

The picture below shows a roller coaster car at three different points during the ride. Point 1 shows the roller coaster car as it begins to go down the first hill. Point 2 shows the roller coaster car as it reaches the bottom of the first hill. Point 3 shows the roller coaster car as it nears the top of the second hill.Consider the three energy bar graphs below:1. What has been identified as the system in the bar graphs? the roller coaster car the roller coaster and the track the roller coaster, the track, and the air molecules 2.) Which of the energy bar graphs best describes the energy of the roller coaster car at Point 2? Energy bar graph A Energy bar graph B Energy bar graph C 3.) Based on the energy bar graphs shown, was energy conserved for the system? Yes No Inconclusive, we cannot determine if energy was conserved for the system based on the information given. The picture below shows a roller coaster car at three different points during the ride. Point 1 shows the roller coaster car as it begins to go down the first hill. Point 2 shows the roller coaster car as it reaches the bottom of the first hill. Point 3 shows the roller coaster car as it nears the top of the second hill.4.) At which position would the car be moving the fastest? Point 1 Point 2 Point 3 Inconclusive, there is no way to determine when the car will move the fastest. 5.) At which position is kinetic energy being converted to potential energy? Point 1 Point 2 Point 3 Inconclusive - no way to know when the kinetic energy is converted to potential energy. 6.) What type of potential energy is being stored between the roller coaster car and the Earth? Magnetic potential energy Elastic potential energy Gravitational potential energy Electric potential energy 7.) At which point is energy being destroyed? Point 1 Point 2 Point 3 Energy is not being destroyed at any point Three balls are hung from a support beam so that when at rest, they are in contact with each other. The first ball is raised from its rest position, as shown by Diagram A. When the first ball is released, it hits the second ball and the third ball raises from its original position to its maximum height while the first two balls remain at rest, as shown in Diagram B.8.) Why does the first ball move when released? The first ball is decreasing its potential energy to become more stable. The first ball is increasing its potential energy to become more stable. The first ball is decreasing its potential energy to become less stable. The first ball is increasing its potential energy to become less stable. 9.) Which statement best describes the energy conversion as the first ball initially swings down? Kinetic energy is being converted to potential energy. Potential energy is being converted to kinetic energy. Magnetic energy is being converted to electric energy. Elastic energy is being converted to thermal energy. 10.) What happens to the energy from the first ball when it makes contact with the second ball? The energy of the first ball is destroyed as the first ball stops moving. The energy of the first ball is transferred to other objects as the first ball stops moving. The energy of the first ball remains with the first ball, just in a different form. The first ball never actually had any energy which is why it stops moving so quickly. 11.) Based on your understanding of energy, what can you predict will happen if no additional energy is transferred into the three-ball system? The three balls will continue to swing back and forth forever to the same height. The three balls will continue to go higher until they eventually go around the beam. The three balls will swing lower each time until they eventually stop moving. 12.) Increasing the temperature of a substance will cause the particles in the substance to: gain potential energy lose potential energy gain kinetic energy lose kinetic energy 13.) Collision theory is used in chemistry to predict the rate of chemical reactions. The theory is based on the idea that for a chemical reaction to occur, it is necessary for the atoms or molecules of one substance to collide with those of another substance.Based on the collision theory, increasing the temperature of the substances involved in a chemical reaction will: increase the rate of the reaction because the particles will collide more often decrease the rate of the reaction because the particles will collide more often increase the rate of the reaction because the particles will collide less often decrease the rate of the reaction because the particles will collide less often The following graph was made to represent the energy changes when a basketball was dropped from a certain height above the floor. Consider the system to include the basketball and the Earth.14.) Which statement best describes the initial conversion of energy when the ball was released? Thermal energy was converted to kinetic and potential energy. Potential energy was converted to kinetic and thermal energy. Kinetic energy was converted to potential and thermal energy. 15.) Which statement best describes the energy at time 6.0 seconds. The kinetic energy is now high since the potential energy is so low. The potential energy is now high since the kinetic energy is so low. Both types of energy are low since energy has been transferred to the surroundings. 16.) Has the law of conservation of energy been broken during this phenomena? Yes, energy has been created. Yes, energy has been destroyed. Yes, energy has been converted and transferred. No, energy has been converted and transferred. The picture shows two wood cars with metal sheets attached. Both metal sheets are negatively charged. The wedges prevent the cars from moving.17.) When the wedges are removed, which way will the cars begin to move? The cars will move towards each other. The cars will move away from each other. Inconclusive, there is no way to determine which direction the cars will move. 18.) Which statement best describes the amount of energy stored in the field between the two cars as they move? The amount of potential energy stored in the field will increase. The amount of potential energy stored in the field will decrease. The amount of potential energy stored in the field will remain the same. 19.) Which graph correctly identifies the amount of energy stored in the field between the two cars as they move? Graph a Graph b Graph c 20.) Which statement best describes the stability of the system as they move? The system becomes more stable as the cars move. The system becomes less stable as the cars move. The stability of the system does not change. A student walks across a carpeted room in his socks. As he reaches out his hand to open the door in the room, an electric spark travels from his finger to the metal doorknob as a sharp sound is heard. 21.) What is happening as the student is walking across the carpeted floor? The student is gaining extra protons from the carpet. The student is gaining extra neutrons from the carpet. The student is gaining extra electrons from the carpet. A student walks across a carpeted room in his socks. As he reaches out his hand to open the door in the room, an electric spark travels from his finger to the metal doorknob as a sharp sound is heard. 22.) What is happening to the amount of electric potential energy in the field around the student as he is walking across the carpeted floor? The amount of electric potential energy around the student is increasing. The amount of electric potential energy around the student is decreasing. The amount of electric potential energy around the student is not changing. A student walks across a carpeted room in his socks. As he reaches out his hand to open the door in the room, an electric spark travels from his finger to the metal doorknob as a sharp sound is heard. 23.) What is happening to the amount of electric potential energy in the field around the student when the spark travels from his finger to the doorknob? The amount of electric potential energy around the student is increasing. The amount of electric potential energy around the student is decreasing. The amount of electric potential energy around the student is not changing. A student walks across a carpeted room in his socks. As he reaches out his hand to open the door in the room, an electric spark travels from his finger to the metal doorknob as a sharp sound is heard. 24.) Is the student more stable before or after the spark? The student is more stable before the spark. The student is more stable after the spark. The student’s stability has not changed. A student walks across a carpeted room in his socks. As he reaches out his hand to open the door in the room, an electric spark travels from his finger to the metal doorknob as a sharp sound is heard. 25. Write a claim: Is the energy conserved within the system as the spark occurs? A student walks across a carpeted room in his socks. As he reaches out his hand to open the door in the room, an electric spark travels from his finger to the metal doorknob as a sharp sound is heard. 26. Provide evidence: Is the energy conserved within the system as the spark occurs? 27. Write a reasoning: Is the energy conserved within the system as the spark occurs? Within your reasoning, include a definition of conserved! 28.) Think back to the phenomena described in questions 8 - 11. The diagram below now shows two balls pulled back from one side. Predict what will happen to the other three stationary balls when the two balls fall and strike them. Provide a thorough explanation of your reasoning.