Add force arrows to the diagram above to show the pressure acting at the surface of the balloon.

Remember that both the air outside of the balloon and the air in the balloon act as a fluid. 

Arrows should be placed on both sides of the boundary of the balloon. 

Arrows around the outside of the balloon pointing inwards to show the pressure of the air acting on surface of the balloon

Arrows around the inside of the the balloon pointing outwards to show the pressure of air inside the balloon acting on the wall of the balloon. 

3. Use the image below to answer the following question

Identify all the possible places in the diagram above where force arrows should be drawn to represent the pressure acting at the surface of a fluid.

Force arrow from air pointing down onto water

Force arrow from water pointing up to sky

Force arrow pointing from air onto sand, leaves and trees