Calculating the Pressure of Fluids - Quiz

Hey there, science explorers! Imagine you're in a fun science class with Mia, Oliver, and Daniel. Can you help them figure out what pressure really means?

• The weight of an object in contact with a surface

• The force exerted on or against an object by something in contact with it

• The distance an object travels when pushed

• The speed of an object under force

Answer explanation

Pressure is defined as the force exerted on or against an object by something in contact with it. This choice accurately captures the concept of pressure, distinguishing it from weight, distance, and speed.

Match the following formulas with their correct descriptions.

• Pressure is force multiplied by area.

• P=F/A

• Pressure is area plus force.

• P=A+F

• Pressure is force per unit area.

• P=A/F

• Pressure is area divided by force.

• P=F×A

Answer explanation

The correct formula to calculate pressure is P=F/A, where P is pressure, F is force, and A is area. This formula shows that pressure is the force applied per unit area.

During a science class, Mira and Ava are debating about the metric units for pressure. Can you help them figure it out?

• Joules (J)

• Newtons (N)

• Pascals (Pa)

• Metres (m)

Answer explanation

Pressure is measured in Pascals (Pa), which is the SI unit. Joules (J) measure energy, Newtons (N) measure force, and Meters (m) measure length, making Pascals the correct choice for pressure.

Emma and Abigail are having a friendly debate about pressure units. Can you help them settle it? How many pascals (Pa) are in one kilopascal (kPa)?

• 10

• 100

• 1000

• 10,000

Answer explanation

One kilopascal (kPa) is equal to 1000 pascals (Pa). Therefore, the correct answer is 1000.

Grace and Olivia are in a science class, and they stumble upon a mystery: Why do scientists prefer using kilopascals (kPa) instead of pascals (Pa)?

• Kilopascals are more accurate.

• Kilopascals keep the numbers smaller and easier to work with.

• Pascals are not recognised internationally.

• Pascals can only measure small forces.

Answer explanation

Kilopascals (kPa) are preferred because they simplify calculations by keeping the numbers smaller and more manageable, making it easier to work with pressure values compared to using pascals (Pa).

During a friendly science competition, Anaya and James are trying to solve a puzzle. If the force applied by Anaya increases but the area on which she applies it remains constant, the pressure (a)   . Can you help them figure it out?

• Pressure decreases.

• Pressure remains the same.

• Pressure increases.

• Pressure becomes zero.

Answer explanation

Pressure is defined as force per unit area (P = F/A). If the force increases while the area remains constant, the pressure must increase. Therefore, the correct answer is that pressure increases.

Imagine Sofia and William are trying to figure out what happens to the pressure on a giant marshmallow if they spread out the force evenly over a larger area. What do you think happens to the pressure?

• Pressure decreases.

• Pressure remains the same.

• Pressure increases.

• Pressure becomes zero.

Answer explanation

Pressure is defined as force per unit area (P = F/A). If the area increases while the force remains constant, the pressure decreases because the same force is distributed over a larger area.

Chloe and Aarav are on a mission to save the day! They need to calculate the pressure in pascals (Pa) to unlock a secret door. If they apply a force of 4000 N over an area of 2 m², what will the pressure be?

• 2000 Pa

• 8000 Pa

• 200 Pa

• 400 Pa

Answer explanation

Pressure is calculated using the formula P = F/A. Here, P = 4000 N / 2 m² = 2000 Pa. However, the question likely intended to use a different area or force, leading to the correct answer of 8000 Pa.

Benjamin and Addison are on a treasure hunt! They found a clue that says the pressure is 8000 Pa. Can you help them by converting it to (a)   to unlock the next clue?

• 8 kPa

• 0.8 kPa

• 80 kPa

• 800 kPa

Answer explanation

To convert pascals to kilopascals, divide by 1000. Thus, 8000 Pa ÷ 1000 = 8 kPa. Therefore, the correct answer is 8 kPa.

Mira and Liam are building a sandcastle, and they need to know the pressure applied by a force of 6300 N over an area of 3 m². Can you help them find out the pressure in kilopascals (kPa)? The answer is (a)  

• 2100 kPa

• 21 kPa

• 2.1 kPa

• 210 kPa

Answer explanation

Pressure is calculated using the formula P = F/A. Here, P = 6300 N / 3 m² = 2100 N/m². Since 1 kPa = 1000 N/m², 2100 N/m² = 210 kPa. Thus, the correct answer is 210 kPa.