HS Physical Science Sem 1 Unit 4 Fluid Forces

Why do solids maintain their shape, whereas fluids do not?

• Because the molecules in solids maintain a regular pattern and only vibrate, or move very slowly.

• Because solids are denser than fluids.

• Because the molecules in solids maintain a regular pattern and move very rapidly.

• Because solids are under greater pressure than fluids.

What is a change that will not affect the pressure in a container?

• changing the weight of the fluid

• heating or cooling the fluid

• increasing the volume of the fluid

• changing the material that the fluid´s container is made of

What happens to the pressure in a sealed container if the amount of a gas in the container increases?

• Pressure decreases.

• Pressure increases.

• Pressure increases and then quickly decreases.

• Pressure stays the same.

What is the correct definition of buoyancy?

• the force on an object that is produced by the surrounding fluid and that pushes the object down

• the force of gravity on an object that is floating

• the force on an object that is produced by the surrounding fluid and that pushes upward on the object

• the force on an object that is produced by air pressure

What does buoyancy depend on?

• the density of the surrounding air and the density of the water

• the density of the object and the force of gravity

• the density of the object and the density of the fluid

• atmospheric pressure and the density of the object

Which characteristic of a fluid affects the pressure in that fluid?

• the amount of hydrogen atoms in the fluid

• the amount of oxygen atoms in the fluid

• the gravity of the fluid

• the weight of the fluid

How is pressure measured?

• Pressure is measured as force per inch.

• Pressure is measured as force per gram.

• Pressure is measured as force per unit area.

• Pressure is measured as force divided by mass.

What happens to pressure when it is applied to an enclosed fluid?

• It is not transmitted.

• It is transmitted evenly to every part of the fluid and to the sides of the container.

• It is higher in some places and lower in others.

What is a hydraulic jack an example of?

• Bernoulli´s principle

• Pascal´s principle

• Newton´s laws of motion

What are gases and liquids categorized as?

• fluids

• solids

• organic compounds

• solutions