DSWO WEEK 12
11-06 Life – Growth/Development - hypothesizing
As people grow older, they often like different kinds of food than they liked when they were very young. Why?
11-08 Life Survival/Change - hypothesizing
How do animals that migrate, or move seasonally from one location to another, find their way?
11-09 Physical – Machines – observing
Think about how an ordinary nail clipper works. Besides the sharpness of the cutting blades, what makes the nail clipper do its job?
11-06 Babies actually have more taste buds than adults. Adults have taste buds mainly on their tongue, while babies have them in nearly every part of their mouth. This means that food that has little flavor to an adult may have a lot of flavor to a baby. In contrast, food that adults find pleasant-tasting may taste too salty, sour or sweet to a baby. As children grow older, their sensitivity to taste lessens and they can enjoy more intense flavors in food.
11-08 Animals that migrate over land recognize rivers, mountains and other land features from year to year. Green turtles seem to be able to detect the distinctive taste of islands in the ocean’s current and follow these across the sea as they travel from the coast of Brazil to the mid Atlantic islands. Some types of birds and fishes have magnetite in their bodies, which provides a built in compass. Other animals seem to learn from older animals that have made the journey before.
11-09 A nail clipper has a lever, a handle that is balanced on a support called a fulcrum. The fulcrum is where the handle, or the part that a person presses down, meets the top part of the clipper. As the handle is pressed, the pressure at the fulcrum pushes the top cutting blade onto the bottom blade.
DSWO WEEK 13
11-13 Life – Health and Human /body - hypothesizing
Rods and cones are two types of cells at the back of your eyes. Cones let you see sharp images and colors. Rods let you see shapes in dim light. Why so you think it is difficult to see in a dark movie theatre after spending tome in a well lit lobby?
11-14 Physical – Forces - observing
How can a pitcher control the movement of a baseball?
11-13 The process of switching from cones to rods takes several minutes. When you first enter a theatre, it is difficult to see because your eyes haven’t begun using the rod cells yet. It takes about 11 minutes to make the switch from cones to rods. After 40 minutes, the rods are about 100,000 times more sensitive to light than are the cones.
11-14 By controlling the speed and direction of the ball’s spin, the pitcher can make a ball curve, drop or hop. The pitcher can spin the ball by gripping it in a certain way or by twisting his wrist while throwing the ball. The stitching on the ball allows a better grip and enhances the effect of air resistance. Air resistance is less on the side of the ball that is toward the direction of the ball’s spin, and the ball will tend to move in the direction of least resistance.