Answer: Sometimes, the balls flatten up when you press the clay too hard. You may also have irregular ball shape when the circular motions of your hands are not even.

Only Two Forces Affect a Spacecraft in Space But lift and drag—both created by movement through air—are absent in the near vacuum of space.

There are two main forces acting on the balloon rocket car: Friction and Air resistance. The friction force is the resistance between two objects sliding against each other.

As you add more gas, the pressure inside the balloon increases, and in response, the balloon expands… up to a point, that is! If you put in too much helium, and the pressure inside the balloon exceeds the atmospheric pressure on the outside of the balloon, the balloon will burst.

What does the child like to see the balloon man do? Answer: The child likes to see that someday the balloon man will let go of all the balloons. Then the balloons will fly high in the sky and the child would see them from below.

The air trapped inside the balloon pushes out the open end, causing the balloon to move forward. The force of the air escaping is the “action”; the movement of the balloon forward is the “reaction” predicted by Newton’s Third Law of Motion.

You might think that because action-reaction forces are equal and opposite that they cancel. However, action and reaction force pairs don’t cancel because they act on different objects. Forces can cancel only if they act on the same object.

Answer: Since air has no definite shape, when air in the balloon escapes, the shape of the balloon changes all the time. For the balloon to move in a straight line, the direction of thrust would have to be equal to the direction of the drag(force resisting the forward force).

Experiment:To make a balloon fly in a straight line

1. Blow up the long balloon and put the peg on the end of it.
2. Put the string through the straw and tie the string to the two chairs.
3. Stick the balloon to the straw by using sellotape.
4. Take the peg off and watch what will happen.

As they travel across the Earth, air masses and global winds do not move in straight lines. This motion can result in large circulating weather systems, as air blows away from or into a high or low pressure area.

The Science Behind It This experiment is all about the air and thrust! Once you let out the air inside of your balloon, it creates a forward motion called THRUST! Thrust is a pushing force created by energy that pushes your balloon all the way across your string!

When a constant force is applied (inflated balloon), the object with the least mass will have the greatest acceleration (PS2.

Some of the things that slow balloon cars down, that you have to overcome, are their own weight, air resistance, friction, and inefficient use of the air escaping the balloon. Reducing weight, minimizing drag, cutting friction and improving nozzle air flow will all help make your balloon car go faster.

A car’s speed is often determined by the friction between its wheels and the road. When you drove your toy car over the smooth tile, the wheels were met with little resistance. You can set up a “friction obstacle course” and see which one of your friends can drive the car the fastest over all the tricky surfaces.

4 Meters

Wheels (Select one)

• Bottle caps.
• Candy mints (with a hole in the middle)
• CDs.
• Cardboard circles.

Preparation

1. Cut one of the straws in half.
2. Tape both pieces of the straw to one side of the water bottle.
3. Cut the wooden skewer in half and push each piece through one of the straws.
4. Have an adult help use the scissors to poke a “+”-shaped hole directly in the center of each plastic bottle cap.