Forces 2 - Pressure

Poll

Exp 1: A balloon was pressed against a nail.

Exp 2: A balloon was pressed against 10 nails.

Predict what will happen to the balloons.

• The balloon in Exp 1 burst with less effort than in Exp 2.

• The balloon in Exp 2 burst with less effort than in Exp 1.

• Both balloons burst with the same amount of effort.

• Both balloons did not burst.

Open Ended

The balloon only bursts when the pressure on the balloon is high enough. What are the two factors affecting the pressure on the balloon?

Multiple Choice

The balloon burst easily with a single nail because the _____________.

• more force was used

• less force was used

• surface area of contact was greater

• surface area of contact was smaller

Multiple Choice

The balloon did not burst easily when a very large number of nails were used because the _____________.

• more force was used

• less force was used

• surface area of contact was greater

• surface area of contact was smaller

Multiple Choice

The balloon only burst when a very large number of nails were used because _____________.

• more force was used

• less force was used

Multiple Select

Therefore, the pressure increases when ________.

• the surface area of contact increases

• the surface area of contact decreases

• force increases

• force decreases

Multiple Choice

What do you think is the formula for pressure? Pressure =

• Force/contact area

• contact area/force

• force x contact area