Understanding the Concepts

* Force (F): The push or pull on an object. Measured in Newtons (N).

* Mass (m): The amount of matter in an object. Measured in kilograms (kg).

* Acceleration (a): The rate of change of velocity. Measured in meters per second squared (m/s²).

Newton's Second Law of Motion

Newton's Second Law of Motion states: F = ma

This means that the force acting on an object is equal to its mass multiplied by its acceleration.

Calculation

1. Identify the knowns:

* Force (F) = 18 N

* Mass (m) = 3 kg

2. Rearrange the formula to solve for acceleration (a):

* a = F / m

3. Substitute the known values:

* a = 18 N / 3 kg

4. Calculate the acceleration:

* a = 6 m/s²

Answer: The acceleration of the 3 kg rock is 6 m/s².