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The problem asks to calculate the **mechanical advantage** of a lever. The mechanical advantage (MA) is calculated using the following formula:

\[
MA = \frac{\text{Load (output force)}}{\text{Effort (input force)}}
\]

In this case:
- The load (output force) is \(300 \, \text{N}\) (the weight of the rock).
- The effort (input force) is \(75 \, \text{N}\) (the force applied).

Substituting these values into the formula:

\[
MA = \frac{300 \, \text{N}}{75 \, \text{N}} = 4
\]

### Final Answer:
The mechanical advantage of the lever is **4**.

This means that the lever multiplies the applied force by 4, making it easier to lift the rock.

Would you like further explanation or more details?

Here are some related questions:
1. What does a mechanical advantage greater than 1 indicate about a machine?
2. How does the length of the lever arm affect the mechanical advantage?
3. What is the relationship between mechanical advantage and efficiency?
4. How does friction affect the actual mechanical advantage of a lever?
5. Can the mechanical advantage of a lever be less than 1, and what does that mean?

**Tip**: A high mechanical advantage means you need less effort to lift or move an object. However, in real-life situations, friction may reduce the actual advantage!

A lever is used to lift a 300 N rock. If the effort applied is 75 N, calculate the mechanical advantage of the lever.

Learn how to calculate the mechanical advantage of a lever used to lift a 300 N rock with an applied effort of 75 N. This problem explores the principle of levers and the formula for mechanical advantage, suitable for students in Grades 6-8.

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