Bernoulli Principle Quiz: Test Energy Balance In Fluid Flow

Concept: speed–pressure connection. In many ideal flow situations, when speed increases, pressure decreases. This is because energy in the flow is traded between pressure energy and kinetic energy.

Concept: energy tradeoff. If the flow is steady and losses are small, Bernoulli says pressure energy can convert to kinetic energy. That makes pressure drop where speed rises.

Concept: pressure difference and lift (simplified). If airflow speed differs above and below, the pressures can differ. A lower pressure above than below contributes to upward lift.

Concept: ideal vs real flow. Bernoulli assumes no significant energy loss to friction. Real fluids can lose energy, so Bernoulli is an approximation unless losses are included.

Concept: pressure-driven motion. Fluids move from higher pressure toward lower pressure regions. A fast jet can create a lower pressure zone that pulls surrounding fluid in.

Concept: pressure gradients drive flow. A pressure difference provides a net force on the fluid. That force can accelerate the fluid from high pressure to low pressure.

Concept: energy conservation. Bernoulli expresses how pressure, speed, and height trade energy. It’s an energy balance for flowing fluids.

Concept: pressure–speed trade. Higher kinetic energy per volume corresponds to lower pressure energy per volume in the ideal Bernoulli balance.

Concept: streamlines. Streamlines show the direction of the flow field. Bernoulli is often applied along a streamline in its simplest form.

Concept: fast wind and pressure drop. Faster air above the roof can lower pressure above. If pressure inside is higher, the net force can lift the roof.

Concept: venturi effect. Continuity increases speed in the narrow section. Bernoulli then predicts the static pressure drops there.

Concept: lower pressure in fast flow. Faster air between the strips lowers pressure there relative to the outer air. Higher outside pressure pushes the strips inward.

Concept: Bernoulli energy balance. Bernoulli is a conservation-of-energy statement for a moving fluid. It connects how pressure, speed, and height changes compensate each other in an ideal flow.

Concept: continuity + Bernoulli (intro). A smaller opening increases speed because the same flow is squeezed through a smaller area. That speed change often comes with a pressure change along the flow.

Concept: venturi effect. In a venturi, the throat has higher speed. Bernoulli predicts lower static pressure there (in ideal conditions).

Concept: fast air lowers pressure. Blowing fast air over the top of a straw can lower pressure there. The higher pressure in the cup can push liquid up the straw.

Concept: not “always”. Pressure depends on speed, height, and losses, and it varies from place to place. Bernoulli compares points along a flow under specific conditions.

Concept: two different conservation laws. Continuity is mass conservation (flow rate relationships). Bernoulli is an energy relationship (pressure–speed–height tradeoffs).

Concept: real-world losses. Friction converts some mechanical energy into heat. That means pressure drops more than ideal Bernoulli predicts.

Concept: applicability. Honey is very viscous, so losses are large and simple Bernoulli is less accurate. Bernoulli is best for steady, low-loss flows.