Newton used the phrase quantity of motion for

Options

A. momentum
B. force
C. acceleration due to gravity
D. None of these

Explanation

To solve the question "Newton used the phrase quantity of motion for," we can follow these steps:

### Step 1: Understand the Terms
- **Quantity of Motion**: This phrase refers to a measure of how much motion an object has. In physics, this is often related to how mass and velocity contribute to an object's motion.

### Step 2: Identify the Options
- **Option 1: Momentum**: Momentum is defined as the product of an object's mass and its velocity (p = mv). It is a measure of the quantity of motion an object possesses.
- **Option 2: Force**: Force is an interaction that causes an object to change its velocity (F = ma). It is not directly related to the quantity of motion.
- **Option 3: Acceleration due to gravity**: This is a specific type of acceleration experienced by objects in a gravitational field and does not represent the quantity of motion.
- **Option 4: None of these**: This option suggests that none of the previous options are correct.

### Step 3: Analyze the Correct Answer
- Since momentum is defined as the quantity of motion in a body, and Newton himself referred to momentum when discussing the motion of objects, we can conclude that the correct answer is **Option 1: Momentum**.

### Conclusion
Newton used the phrase "quantity of motion" to refer to **momentum**.

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