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In these activities you should notice the effect of gravity on some objects in motion. You may want to draw pictures of how the objects travel.
 

Try It #1

This is a tough one. Take an object (that won’t break) and drop it. Notice the path it takes to the ground – straight down. This is because when you let the object go, gravity pulls it to Earth.

You can increase the speed it falls by throwing it down instead of just dropping it. You are applying a force.

 

Try It #2

Grab a ball and a friend. You should play catch. Notice the path the ball takes as you throw it to one another.

Now have a throwing contest. See who can throw the ball the farthest. Notice the path of the ball.

 

The ball doesn’t travel straight down. It goes in kind of an arched path. You are applying a force when you throw the ball. The ball is going away, maybe even upwards, but gravity keeps pulling. After a short time gravity takes over and pulls the ball to Earth.

Applying more force can overcome gravity for longer periods. Objects can travel farther. That is why strong, professional athletes can throw farther than kindergarteners. You can also use tools to help you apply more force.

 

Try It #3

Get a ball and racket or bat. Try throwing the ball as far as you can by hand. Mark your best throw. Next, hit the ball with the racket or bat. Mark your best hit. Did you hit the ball farther than you could throw it? The tool helped you apply more force.

 
 
EarthMoonImage
LivingOrNotLivingImage
ForceMotionImage
GravityImage
HeatAndEnergyImage

Download the plug-ins: Get Adobe Acrobat Reader, and Get Quicktime Player. (The QuickTime plug-in is needed to play sounds and movies correctly.)

Want to share photos of you or your friends doing this activity? Send it in an e-mail with the following information:

  1. The title of the activity
  2. The URL (Internet address)
  3. Your name.

Remember that no pictures can be used that show student faces or student names on it. 

Teachers should view the Teacher Site Map to relate Sci-ber text and the USOE 3rd grade science core.


Updated October 24, 2008 by: Glen Westbroek

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