Air Resistance

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Kid Science: Air Resistance

Supplies:

• Two identical toy cars • Two strips of cardstock or other sturdy paper which are both as wide as the cars and a little bit longer • Tape • Book or board which can serve as a track for both cars at the same time • Stack of books • Blow dryer or fan

Directions:

1. Stack the books and place the board on top such that one end is balancing on the books and the other is on the floor. This should create a ramp or inclined plane.

2. Plug in the blow dryer and place it at the bottom of the ramp.

3. Tape the edge of one of the pieces of cardstock to the front end of one of the cars and bend it over the top so that it creates a curved cover to the car. Secure it with tape underneath. This car should now have a silhouette or shape that looks like an arch.

4. Tape the other piece of cardstock to the front edge of the other car and bend it into a right angle, securing it to the top of the car. This car should now have a silhouette or shape that looks like a block.

5. Make a prediction, if both cars race down the ramp, which will reach the bottom first?

6. Place both cars at the top of the ramp and let go at the same time. What happened? Did one of the cars reach the bottom first or did they both reach the bottom at the same time?

7. Make another prediction, will the same thing happen if there is air pushing on both of the cars?

8. Turn on the fan or blow dryer and make sure that the air is able to reach both cars at the same time. If you are using a blow dryer and

the air current is too narrow to reach both cars, then you will have to do each car individually and time them to compare.

9. Place both cars at the top of the ramp and let go. Does one of them reach the bottom faster now? Did your results change?

What’s happening?

Have you ever been in a moving car and stuck your hand out the window? If you do that and change the shape of your hand--making curves and holding your hand up--you might find that the air pushes back on your hand when it is upright but goes over your hand when it is a curve. This has to do with aerodynamics which is what this experiment explores. Aerodynamics

talks about how air moves around

things. Shapes like curves are more aerodynamic--air moves faster and easier around them. Shapes like blocks are less aerodynamic--air does not move around them as easily so they experience drag or resistance. This happens with our cars to--the block shaped car experiences more drag and so is slowed down more when the fan or blow dryer is turned on.

Experiment Provided by:

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