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Related Flashcards
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Cards In This Set
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1. Growth and change
Think of someone in your class. Imagine that your classmate moves away and you meet that person in five years. List three ways the person's appearance might change. List three ways the person's appearance might stay the same.
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The person might have grown taller: the face may be longer and less full: the hair style may be different. The color of the person's eyes, skin, and hair;and facial features, such as the shape of the eyes and nose, most likely stayed the same. Extra Science fun: Shape of eyes, nose, and mouth can give clues about who's who.
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Simple Machines- Rollers
First push a heavy book across your desk with one finger. Next put three pencils under the book. Use your finger to push the book across your desk again. Is it easier or harder to push the book now? What do you think caused the difference in the amount of force you have to use?
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It's easier to push the book using the pencils. The pencils allow the book to roll across the desk. It takes less effort (force) to roll an object than it does to slide it across a surface because rolling produces less friction than sliding does.
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Raindrops and Snowflakes
Raindrops plop but snowflakes float! Why? To help you find out, get two sheets of writing paper. Crumple one into a ball. Hold it in one hand and the flat sheet in the other. Stretch out your arms and drop both objects at the same time. What happens? Why do you think raindrops and snowflakes fall differently?
Extra science fun: Write a Poem describing how raindrops fall. Write another poem describing how snowflakes fall.
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The crumpled ball falls quickly; the flat sheet floats to the ground. A snowflake is flatter and has greater surface area than a raindrop; as the snowflake falls, the upward force of the air pushes against its surface, causing it to fall more slowly.
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Dental Health
YOu are born with baby teeth that one day fall out and are replaced by permanent teeth. Why is it important to take care of baby teeth if they're not meant to last?
Extra Science Fun! Look in a mirror. How many baby teeth do you have? How many permanent teeth do you have?
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Baby teeth help prepare the mouth for the permanent teeth that follow; they help the permanent teeth to erupt in their "correct" positions. It's important to keep both sets of teeth clean in order to maintain good health, prevent tooth decay, and ward off gum disease.
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Jan wants to talk to someone who is across the room. She doesn't want to shout and she doesn't want to walk across the room. What can Jan do to make her voice sound louder?
Extra Science Fun! Suppose someone gave Jan a large sheet of paper to help her with problem. What could she do with the paper to make her voice sound louder?
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Jan can cup her hands around her mouth and talk through them. The "cup" collects the sound waves and sends them forward.
Extra science fun: If Jan rolls the paper into a cone and speaks through the narrow end, her voice will sound louder.
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Earth and Sun
A very long time ago, a greek astronomer named Aristarchus said that the Earth moved around the Sun. Most people did not believe him. They tought the Earth stood still while the Sun moved around it. Suppose Aristarchus came back to life and you met him. Write three things you could do to show him that people today believe his ideas about Earth moving around the Sun.
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Show Aristarchus models of the solar system at a planetarium or museum; show him books about space; have an astronomer explain current beliefs about the motion of the Earth around the sun.
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Flight
People have dreamed of fying for thousands of years. At one time, most people thought that a dream like that would never come true. Today millions of people fly in planes every day. Write about another "dream" that might come true with the help of scientists.
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Advancement in space travel, medical research, or environmental studies.
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