PHYSICAL SCIENCE

HI. Gravitational Energy . V. Potential IV. Kinetic Energy Energy a. l, III and IV . i c. I, ILIIH, 1V b. c. IV and V ' . _ . andV , d. 111, IV, and V 3. When can you say that there is kinetic energy? a. A heavy object is place on a high shelf. _ C. Cars on the top of a hill. b. A stretched rubber band d. Truck that goes dOthill. 4 When can you say that there 15 potential energy? 1 a. T we identical balls are thrown from the top of a cliff each with the same speed. I}. A ball IS dropped from the top of a tall building and reaches terminal velocity as it fails. cA kite being own. - d. A weighty object is positioned on a soaring bookshelf. 5. In which instances can you say that work was done? . ' a. A man pushing a wall I b. A boy climbing a tree . c. A truck parked along the road d. A kite being own _ f _l . Aluminum 2. Water _ ___3. Rubber 4. Silver 5. Plasma Directions: Classify the following if it is conductor, semiconductor, or insulator. 6. Silicon 7. Tiles Glass 9. Cloth 1 0 . Graphite Directions: Analyze and solve the problem. Write your answer in two decimal places with solution and unit. (15 points per item) 1. At what height must a 45.34 kg basket be lifted to gain a gravitational potential energy of 113.56 J? Given: Formula: Solution: 2. An 89.45 kg ball gains a kinetic energy of 456.67 J after moving a certain speed. What is its speed? Given: Formula: Solution:Directions: Read and analyze the statements/questions about the planets in the Solar System. Underline the letter and word of your answer. Energy in Its Many Forms We define energy as the ability to change an object or its environment. Change can occur in several ways. A speeding automobile can change itself, people, and objects in its path. The energy that causes the car's motion is normally stored in the chemical bonds of gasoline. Energy is stored in many other forms. A heavy object placed high on a shelf has a potential to change almost anything it might fall on. A stretched spring or rubber band has the ability to give an object a high velocity. Anything moving, from a roller coaster car to a falling leaf, is capable of causing some kind of change in an object it touches. Moving objects have a form of energy called kinetic energy. The work done by the electric motor was saved or stored by raising the cars to the top of the hill. The cars were said to have potential energy. In the roller coaster for example, potential energy is stored in the cars as result of their height, because work was done on the cars against gravity: When they go downhill, the potential energy is changed into kinetic energy. 1. What is energy? a. It is the capacity to do force which causes displacement on a particular object. b. It is the ability to alter an object based on its position and condition. C. It is the capability to alter an object or its atmosphere that leads to work. d. All of the above. 2. What are the general forms of energy? II. Elastic Energy I. Chemical Energy