A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar.

Answer

To calculate the mechanical advantage (MA) of the crowbar, follow these steps:

### Step 1: Identify the lengths
- The total length of the crowbar is given as 120 cm.
- The distance from the fulcrum to the load (load arm) is given as 20 cm.

### Step 2: Calculate the effort arm
- The effort arm is the distance from the fulcrum to the point where the effort is applied.
- To find the effort arm, subtract the load arm from the total length of the crowbar:
\[ \text{Effort arm} = \text{Total length} - \text{Load arm} \]
\[ \text{Effort arm} = 120 \, \text{cm} - 20 \, \text{cm} = 100 \, \text{cm} \]

### Step 3: Calculate the mechanical advantage
- The mechanical advantage is the ratio of the effort arm to the load arm:
\[ \text{Mechanical Advantage (MA)} = \frac{\text{Effort arm}}{\text{Load arm}} \]
\[ \text{MA} = \frac{100 \, \text{cm}}{20 \, \text{cm}} = 5 \]

### Final Answer
The mechanical advantage of the crowbar is 5.

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