2.8.10 1. The law of conservation of energy states that

1. 2.8.10 1. The law of conservation of energy states that Energy can be created or destroyed, as well as being converted from one form to another Energy is created when it is converted from one form to another In most systems some energy is destroyed and lost as heat Energy cannot be created or destroyed but can be converted from one form to another 2. An example of a mixture is Solid NaCl Liquid NaCl NaCl dissolved in water Water (H2O)

2. 2.9.10 1. In addition to distance, what factor determines the force of gravity between two objects? • The volume of each • The mass of each • The diameter of each • The chemical formula of each 2. In order for a wave to form, what must energy cause a medium to do? • Vibrate • Compress • Melt • Diffract

3. 2.10.10 1. What is the BEST explanation for why the Moon orbits the Earth rather than the Earth orbiting the Moon? • Earth has less mass • Earth rotates faster than the Moon • The Moon has no gravitational pull on anything • Earth has more mass than the Moon 2. The actual mass of a ball is 32.19 grams. Four students measured and recorded the mass of the ball. Which measurement made by the students is the MOST accurate? • 30g • 32g • 32.2 g • 31.29g

4. 2.11.10 • During tug of war, the rope accelerates toward the left. What is true about the forces acting on the rope? a. The force toward the right is greater that the force toward the left b. The force toward the left is equal to the force toward the right c. The force toward the left is greater than the force toward the right d. There can only be a force pulling toward the left 2. Sound waves travel fastest when moving through • A vacuum • A gas • A liquid • A solid

5. Slide one D/C Slide two B/A Slide three D/C Slide four C/D