(Savvas 13.2) Forces and Pressure in Fluids

In a fluid-filled container, the pressure is greater at the base of the container because:

• the fluid is denser at the base.

• the fluid exerts more force at the base due to gravity.

• the container's base is wider.

• the fluid at the base is at a higher temperature.

Is the following sentence true or false? If you squeeze a container filled with fluid, the pressure within the fluid increases equally throughout the fluid.

• True

• False

According to Pascal’s principle, when there is a change in pressure at any point in a fluid, the change is transmitted:

• equally in all directions throughout the fluid.

• only to the surface of the fluid.

• only to the bottom of the fluid.

• only to the sides of the container.

The science of applying Pascal’s principle is called ________________.

• Hydraulics.

• Thermodynamics.

• Electrodynamics.

• Aerodynamics.

In a hydraulic lift system, an increased output force is produced because constant ________________ is exerted on the larger area of the output piston.

• Pressure.

• Volume.

• Temperature.

• Velocity.

Is the following sentence true or false? In a hydraulic system, the output force is greater than the input force because the pressure acting on the output piston is greater than the pressure acting on the input piston.

• True

• False

Circle the letter of the sentence that correctly states Bernoulli’s principle.

• As the speed of a fluid decreases, the pressure within the fluid decreases.

• As the speed of a fluid increases, the pressure within the fluid increases.

• As the speed of a fluid increases, the pressure within the fluid decreases.

• Fluid motion has no effect on pressure within the fluid.

Because the air traveling over the top of an airplane wing moves faster than the air passing underneath the wing, the pressure above the wings is __________ than the pressure below the wing.

• lower

• higher

• equal

• unchanged

Lift is a force that acts perpendicular to the relative motion of an object through the air. How does it relate to an airplane’s flight?

• It allows the airplane to ascend and stay in the air.

• It helps the airplane to move forward.

• It causes the airplane to descend.

• It stabilizes the airplane during turns.

Tags

NGSS.HS-PS2-1

A spoiler on a racecar is designed to:

• Increase speed

• Reduce drag

• Push the car toward the ground.

• Enhance appearance

Tags

NGSS.HS-ETS1-3