Air pressure
This force is caused by air molecules constantly colliding with surfaces.
Fluid pressure in a liquid increases as this quantity increases.
What is depth?
The upward force exerted on an object submerged in a fluid is called this.
What is buoyant force?
This principle states that pressure applied to a confined fluid is transmitted equally throughout the fluid.
What is Pascal's principle?
According to Bernoulli’s Principle, when fluid speed increases, pressure does this.
What is pressure decreases?
This is why your ears “pop” when you change altitude quickly.
What is change in air pressure?
Fluid pressure acts in this number of directions.
What is all directions?
An object will float when the buoyant force is greater than or equal to this.
What is the object's weight?
Hydraulic brakes and car lifts work because of this principle.
What is Pascal's principle?
This device uses Bernoulli’s Principle to create lift.
(answers vary)
A sealed plastic bottle caves in after the air inside cools. This happens because the outside air pressure is ______ than the inside pressure.
What is greater?
Two holes are made at different depths in a water container. The deeper hole produces a stronger stream because ________.
What is the pressure is greater at a greater depth?
A rock sinks in water because its weight is ______ the buoyant force.
What is greater than?
If the area of a piston increases, the output force in a hydraulic system will ______ (assuming constant pressure).
What is increase?
When air flows faster over the top of a wing, the pressure above the wing is ______ than below.
What is lower?
Explain why a suction cup sticks to a smooth surface.
What is outside air pressure pushing the cup against the surface?
Explain why dams are built thicker at the bottom than at the top.
What is fluid pressure increases with depth?
Explain how a massive steel ship can float on water.
What is it displaces enough water so the buoyant force equals its weight?
Explain how a small input force can lift a large car in a hydraulic lift.
What is pressure is transmitted equally and acts over a larger area?
Explain why blowing across the top of a piece of paper causes it to rise.
What is faster air above creates lower pressure than below?
A can is crushed when steam inside condenses. Use air pressure to explain why.
What is outside air pressure becomes greater than inside pressure, crushing the can?
Two containers hold the same liquid to the same depth but have different shapes. Explain why the pressure at the bottom is the same.
What is pressure depends on depth, not container shape?
An object floats in saltwater but sinks in freshwater. Explain why.
What is saltwater is denser, creating a greater buoyant force?
A hydraulic system uses pistons with very different areas. Explain the trade-off between force and distance moved.
What is greater force comes with smaller distance moved, conserving energy?
Explain why roofs can lift off houses during strong winds.
What is fast-moving air above the roof creates lower pressure than inside?