Understanding Moment

* Moment (also called torque) is a rotational force. It's the tendency of a force to rotate an object around an axis.

* Formula: Moment (M) = Force (F) x Perpendicular Distance (d)

Calculations

1. Force (F): 50 N

2. Perpendicular Distance (d): 0.4 m (This is the length of the spanner, assuming the force is applied perpendicular to the spanner)

3. Moment (M): 50 N * 0.4 m = 20 Nm

Answer: The size of the moment created by the spanner is 20 Nm (Newton-meters).