8th Grade: Chapter 4 Test "Fluids & Forces"

Front

What principle explains how an airplane wing generates lift?

Back

Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.

Front

What factors affect the drag force on an object?

Back

The drag force depends on the surface area of the object, the speed of the object, and the density of the surrounding fluid, but not on the color of the object.

Front

What causes a curve ball in baseball?

Back

The curve ball is caused by the Bernoulli effect, where differences in air pressure create a curve in the ball's trajectory.

Front

What can cause a roof to lift off a house during a storm?

Back

The lifting of a roof can be explained by Bernoulli's principle, where fast-moving air over the roof creates lower pressure compared to the still air inside.

Front

What is buoyant force dependent on?

Back

The buoyant force on an object is dependent on the volume of the object submerged in the fluid.

Front

Define Archimedes' principle.

Back

Archimedes' principle states that an object submerged in a fluid experiences a buoyant force equal to the weight of the fluid displaced by the object.

Front

What is Pascal's principle?

Back

Pascal's principle states that a change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid.

Front

How does the density of an object affect its buoyancy?

Back

An object will float if its density is less than the density of the fluid it is in; otherwise, it will sink.

Front

What is the relationship between fluid speed and pressure according to Bernoulli's principle?

Back

According to Bernoulli's principle, as the speed of a fluid increases, the pressure within the fluid decreases.

Front

What is drag force?

Back

Drag force is the resistance experienced by an object moving through a fluid, which depends on various factors including speed and surface area.