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When forces are drawn, the arrow shows both direction and strength.

Here's the step by step explanation:

1. Direction: The arrow points towards the direction in which the force is applied. If the arrow points upwards, the force is applied upwards. If it points downwards, the force is applied downwards. The same applies for left, right, or any other direction.

2. Strength: The length of the arrow represents the magnitude (or strength) of the force. A longer arrow indicates a stronger force, while a shorter arrow indicates a weaker force.

So, the arrow in a force diagram helps in understanding both the direction and the magnitude of the force.