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

1. Define: What is the moment of a force?

2. State: What is the formula for calculating a moment?

3. Identify: What is the SI unit for a moment?

4. Define: What is a pivot (or fulcrum)?

5. State: What is the Principle of Moments?

6. Identify: To get the biggest turning effect from a spanner, should you push close to the nut or far from it?

7. List: Give one everyday example of using a lever.

8. Define: What is a couple of forces?

9. Identify: Give one example of using a couple.

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

1. Calculate: A girl pushes down on a seesaw with a force of 300 N at a distance of 1.5 m from the pivot. Calculate the moment she produces.

2. Apply: A boy wants to balance the seesaw from the previous question. If he weighs 450 N, how far from the pivot on the other side must he sit?

3. Explain: Why is it much harder to open a heavy door by pushing near the hinges compared to pushing near the handle?

4. Describe: Explain the forces involved when you turn on a circular tap handle with your thumb and finger. Why is this a couple?

5. Compare: Two forces can produce a moment. A force of 10 N is applied 2 m from a pivot. A force of 20 N is applied 1 m from the pivot. Which one produces a larger turning effect?

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

1. Problem-Solving: A uniform 6-meter-long plank has a weight of 120 N and is supported by a pivot at its center. A weight of 40 N is placed 2 m to the left of the pivot. A second, unknown weight (W) is placed 3 m to the right of the pivot, so the plank is balanced. (a) Draw a clear diagram of this setup, showing all forces and distances. (b) Calculate the clockwise moment produced by the unknown weight W in terms of W. (c) Calculate the total anticlockwise moment about the pivot. (d) Using the Principle of Moments, calculate the value of the unknown weight W.