Physicists are scientists who study the physical world around us. They learn all about matter, time, space, and energy!
Try this experiment today to learn about gravity and forces!
Materials:
Balloon, long piece of kite string (about 10-15 long), straw, and tape.
Time Estimated:
10-15 minutes
Directions:
Tie one end of the string to a chair, door knob, or other support in the room.
Put the other end of the string through the straw.
Pull the string tight and tie it to another support in the room
Blow up the balloon (but don’t tie it). Pinch the end of the balloon and tape the balloon to the straw.
Let go and watch the rocket fly!
Think Like A Scientist:
What pushes the balloon to fly like a rocket?
Does the type of string affect how fast or far the rocket travels?
Can you relate this experiment to real rockets? Share your answers in the comments below!
How It Works:
This experiment is all about air and thrust.
As the air rushes out of the ballon, it created a forward motion called thrust. Thrust is a force or a push created by energy.
When you let go of the balloon the air comes out of the balloon and creates a force that pushes the balloon in the opposite direction.
So, when the air comes out why does it push the balloon in the opposite direction?
This is because a law called Newton’s third law of motion: This law says that for every action there is an equal and opposite reaction. So that’s why the air that is coming out toward the left side of the room, pushes the balloon to the right side of the room.
In this experiment, the energy is coming from the energy of the balloon forcing the air out. In real rockets, thrust is created by the force of burning fuel as it blasts from the rocket engine and that energy pushes the rocket up.
Looking for more fun at home STEM activities for your young scientist? Check out our workbook full of exciting science experiments and empowering activities!
