Equipment: Paper cup, scissors, balloon, marshmallow.
Method: 1. Cut out the bottom of the cup. 2. Cut off the neck of the balloon. 3.Stretch the open end of the balloon over the bottom of the cup. 4. Place marshmallow in cup. 5. Pull balloon back to fire marshmallow.
Results:
Discussion:
In the bottom of the cup, there's a hole and cutted balloon wrap around it, put the marshmallow inside it, all the forces ( thrust, friction, gravity, and support ) were even as it wasn't moving. The force acting to when you pull the marshmallow together with the balloon with your finger and hand is friction. Release it and the marshmallow will have a big thrust force, the more you pull the marshmallow together with the balloon, the more thrust force you get. Then as soon the marshmallow leaves the cup, the gravity is acting on, pulling it down to the ground, as it landed on the ground, the ground support the marshmallow to prevent gravity pulling it.
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