Level 1: Core Concepts Check (Aiming for a Pass - 'S')

1. State: What is the formula for pressure?

2. Identify: What is the SI unit for pressure?

3. List: Name the two factors that affect the pressure at a point within a liquid.

4. Define: What is upthrust?

5. State: What is Archimedes' Principle?

6. State: What is Pascal's Principle for enclosed liquids?

7. Recall: What happens to the pressure in a liquid as the depth increases?

8. Identify: Name an instrument used to measure atmospheric pressure.

9. True or False: A large, heavy steel ship sinks because steel is denser than water.

Level 2: Connecting the Dots (Aiming for a Credit - 'C')

1. Explain: A person wearing sharp, high-heeled shoes can easily damage a wooden floor, while a person wearing flat shoes with the same weight does not. Explain this using the concept of pressure.

2. Apply: An object has a weight of 50 N. When it is fully submerged in water, the upthrust on it is 50 N. Describe what will happen to the object.

3. Describe: Briefly explain how the hydraulic braking system in a car works, mentioning the key principle involved.

4. Explain: Why do deep-sea divers need to wear very strong, pressurised suits?

5. Calculate: Find the pressure at the bottom of a swimming pool that is 2 m deep. (Use density of water ρ = 1000 kg/m³, g = 10 m/s²).

Level 3: Exam Challenge (Aiming for a Distinction - 'A'/'B')

1. Problem-Solving: A solid block has a weight of 120 N. Its base is a rectangle measuring 0.2 m by 0.3 m. When the block is fully submerged in a liquid, it displaces 40 N of the liquid. (a) Calculate the pressure the block exerts on the ground when placed on its base. (b) What is the magnitude of the upthrust acting on the block when it is fully submerged? (c) Will the block sink or float in this liquid? Explain your reasoning. (d) What is the apparent weight of the block when it is fully submerged?