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With mouth wide open, vibrating air coming up the throat from the vocal chords leaving the open mouth and spreading in all directions. Hi, I am Janice VanCleave, author of 50+ best-selling science experiment books for children ages 4 through high school. I taught science for 27 years and now am creating this science website.   My scream was not staged. The picture was to be of two adult cats, which I was holding. A microsecond before the camera snapped, the two cats dug their claws into my skin as they prepared to leap out of my arms. A picture like this is great for making inferences. Kids could make "guesses" as to why I am screaming. They would be drawing on facts from the photo, such as I look like I am in pain or maybe I am just pretending.

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Inertia: Newton’s First Law of Motion

Inertia is a term used to describe how difficult it is to stop an object that is in motion, such as football players charging toward the goal line.

inertia-football-player-running
inertia-football-player-2-running

Which player would be harder to stop, A ( the man who weigh about 350 pounds) or  B (the boy who weighs about 100 pounds)?

Think!

If I had a choice, I’d try to stop the boy who weighs less. The heavier man most likely would knock me down and keep on going.

Heavy objects that are in motion are much harder to stop than are lighter objects, and this is because heavier objects have more inertia.

Inertia is a term used to describe how difficult it is to move a stationary object.

Which would be easier to move, A (the elephant) or B (the kitten)?

Think!

Even baby elephants can weigh from 165 to 230 pounds when born, while kittens average about 3 pounds at birth.

inertia-sitting-elephant

So, which would be easier to move, A (an elephant) or B (a kitten)?

inertia-sitting-kitten1

My choice would be the kitten, which weighs less. Object that have a larger weight are harder to move, so they have more inertia.

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The spoon hanging from the string vibrates when struck and these vibrations are transmitted through the string and the sound is amplified by the plastic cups. ABOUT ME: Hi, I am Janice VanCleave, author of 50 best-selling science experiment books for children ages 4 through high school. I taught science for 27 years. MORE.....

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