You pick up your school bag by muscular force. The muscular force is also known as....

Options

A. frictional force
B. magnetic force
C. magnetic force
D. all of these.

Explanation

To solve the question, "You pick up your school bag by muscular force. The muscular force is also known as....", we can follow these steps:

### Step 1: Understand the Concept of Muscular Force
Muscular force is the force applied by muscles to lift or move objects. It is the result of the contraction of muscles in our body.

**Hint:** Think about how you use your muscles to perform tasks like lifting or pushing.

### Step 2: Identify the Alternative Name for Muscular Force
Muscular force is also referred to by another name. In this context, it is important to know that muscular force can be described in terms of biological processes, as it originates from biological systems (our muscles).

**Hint:** Consider how the force is generated in living organisms.

### Step 3: Evaluate the Given Options
The question provides options:
- A) Friction force
- B) Magnetic force
- C) Biological force

We need to determine which of these options correctly represents the alternative name for muscular force.

**Hint:** Eliminate options that do not relate to the function of muscles.

### Step 4: Analyze Each Option
- **Friction force**: This is the force that opposes motion between two surfaces. It is not related to muscular force.
- **Magnetic force**: This is a force that arises from magnets and does not relate to muscles.
- **Biological force**: This term can be used to describe forces generated by biological systems, including muscular force.

**Hint:** Focus on the terminology that connects to living organisms and their functions.

### Step 5: Conclude the Correct Answer
Based on the analysis, the correct alternative name for muscular force is **Biological force**.

**Final Answer:** The muscular force is also known as **Biological force**.