Things to review for quiz on EMM lessons 2-6: 3.19.13
1. Know the parts of a battery (vocabulary lesson 2, positive, negative electrode, electrolyte, divider, container), and what type of energy a battery stores (chemical). Know the types of energy transformations take place when you connect a battery to a variety of items (chemical to electrical to light and heat) and the energy transformation that takes place when you put a rechargeable battery into a charger (electrical to chemical) Know the difference between wet cell and dry cell batteries (liquid vs paste electrolyte)
2. Understand the two main forces that act on a skydiver as she/he falls (gravity and air friction). Be able to describe what terminal velocity is (constant speed when those forces are equal and opposite in direction). Be able to draw a diagram of the forces acting on the skydiver, showing larger forces with larger arrows).
3. Know the results of all of the labs. The relationship between stretching distance and force (lesson 5.1 Greater stretching distance means proportionally greater elastic force), weight and mass (mass and weight are proportional, as one increases so does the other) (5.2), motor and light energy use (the motor uses less energy) (3), charging time and lit time (the longer the charging time the longer the lit time also proportional and linear)(4), Relationship between weight and friction; The greater the weight the more friction (also proportional)(6).
4. Know the different ways that rock climbers use friction to help them (special shoes, chalk on hands, belay rope around waist)
5. Understand the forces acting on bungee jumpers as they fall and bounce back up. The force of gravity is greater than the force of the bungee cord until they get to the bottom and when the bungee force is greater the jumper bounces back up.