1. A balloon , and a potato
2. A balloon floats in water because it is light.
A potato is heavy so it sinks in water because of it's heavy density.

http://pbskids.org/rogers/sink.html

Instructions

You will use this blog to write posts about the different objects that you will  experiment. You will need to identify the features of the objects that you are going to use, and make a prediction upon the information you have collected.  You will need to have access to the internet to look up images of different objects that you would want to experiment. Make sure that you use at least two objects for this experiment. When you are attaching the images from the computer, make sure to save the pictures first before you attach it. If anyone has difficulties with attaching the images, please use our notes on how upload pictures. There is also an example of how these assignment should be completed. 

Answer the following questions to complete this assignment:

A. Write the names of the two objects that you would like to examine.
B. Make a prediction of whether your object will sink or float.
C. Make sure to have a cup of water to test your objects.
D. Post two pictures that you have examined.
E. You will also need to include a link of a website that you used to help you with this topic.

Follow the example below:

A.  Penny, and a beach ball.
B.  Penny would sink because it is heavier and it has higher density.
     A beach ball would float because it has less mass.

Interactive Website (Sink &Float)