Marshmallow Catapult shooter

 Aim: To make a marshmallow shooter and work out what forces are acting on it.

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: 

When the marshmallow was in the cup all the forces (thrust, friction, gravity and support) were even as it wasn't moving. When the marshmallow left the cup then the thrust force was greater as it sped up. As it came back down to the ground then gravity and friction/ drag were the greater forces as it slowed down and came back down.

Conclusion:

Yes it worked really well. Some groups taped the balloon to the side of the cup which made it more stable which I would include next time. 

Robotic Hand

Step 1: Gather Your Supplies

·         Tape

·         Scissors

·         Cardboard paper or cardstock paper

·         2 standard drinking straws

·         Big straw

·         Yarn or twine

Step 2: Draw Your Robotic Hand

1.   Trace your hand on a cardboard or cardstock paper.

2.   Cut the traced hand out (cutting it a little bigger than the actual tracing).

Step 3: Creating Joints

1.   Mark your finger joints on the cutout.

2.   Draw straight or curved line across it.

Step 4: Creating Your Robotic Hand

1.   Fold the fingers at the lines.

2.   Cut smaller straws to size (leave a little gap between the lines to facilitate in threading the yarn).

3.   Tape straw pieces to the hand.

4.   Thread yarn through the straw pieces. Each finger will have a length of yarn of its own.

5.   Thread all five pieces of yarn through the bigger straw.