Forces within liquids/fluids at rest and in motion

In the image, why is the pressure (P1) higher in the wider part of the pipe compared to the narrower part (P2)? How does Bernoulli’s Principle help us here?

• P1 is higher because of gravitational effects on the fluid

• P1 is higher in the wider pipe because Bernoulli’s principle states that higher volume leads to lower pressure

• P1 is higher in the wider pipe because Bernoulli’s principle states that higher velocity leads to higher pressure

• P1 is higher in the wider pipe because Bernoulli’s principle states that higher velocity leads to lower pressure

Answer according to the image shown. In a hydraulic system, If a force is applied to the small piston, what happens to the force on the large piston? How does Pascal’s Principle explain this?

• The force on the large piston is independent of the area of the pistons

• The force on the large piston decreases with the applied force on the small piston

• The force on the large piston increases proportionally to the applied force on the small piston

• The force on the large piston remains unchanged regardless of the small piston

According to the image, why does the first ball float, and the second ball sink, based on the concept of buoyant force?

• Both balls float due to equal buoyant forces

• The first ball floats due to a greater buoyant force, while the second sinks because of greater weight

• The second ball sinks because it has a lower weight than the first ball

• The first ball floats because it is lighter than the second ball

Pick the right choice according to the image. How does Bernoulli’s Principle explain why the water speeds up in the narrower part of the hose?

• The water moves slower because the pressure increases

• The water moves slower because the pressure decreases

• The water moves faster because the pressure decreases

• The water moves faster because the pressure increases

How does temperature affect viscosity?

• Higher temperature increases viscosity.

• Lower temperature decreases viscosity

• Higher temperature decreases viscosity

• Constant temperature increases viscosity

In the image, why does the water stick on the glass’s surface instead of directly going in the other glass?

• Because the water particles don’t have enough energy to change their shape

• Because water molecules repel each other

• Because the glass has strong cohesive forces

• Because water molecules stick to the glass due to adhesive forces

1. What principle states that an object in a fluid has an upward force on it that is equal to the weight?

• Bernoulli’s Principle

• Archimedes Principle

• Pascal’s Principle

• Momentum principle

Looking at the image. Answer the question. Why does water get absorbed into the paper instead of staying on the surface?

• Because adhesive forces are stronger than cohesive forces

• Because water has a lower viscosity than the paper

• Because the paper creates more pressure on the water

• Because cohesive forces are stronger than adhesive forces

TRUE OR FALSE. In a fluid at rest, the pressure at any point is the same in all directions.

• True

• False

When you look at the image, isn’t the first question that pops up in your head is how can the insects stand on the water without sinking? Pick the answer which you think is correct.

• Because the surface tension of water, caused by cohesive forces, holds the insect up

• Because the insect’s legs are coated with oil, preventing sinking

• Because the insect’s weight is light, in that case it floats on the water

• Because the insect has stronger adhesive forces than the water