More work on Forces

 

We had a lot of fun finding about upthrust as part of our topic on forces.

First we found the weight of the object in Newtons.

Then we measured the weight again with the object in the water.

The difference told us what the force of the upthrust was.

 

 

Then we put little boats on the water to see how much weight it could hold before it sank...

We tried the same boat in salt water to see if the upthrust was greater.