Understanding Gravity

* Gravity is constant: The acceleration due to gravity (g) is approximately 9.8 m/s² near the Earth's surface. This means that all objects, regardless of their mass, fall at the same rate in a vacuum.

* Force of gravity depends on mass: The force of gravity acting on an object is determined by its mass. The heavier the object, the stronger the gravitational force.

Calculating the Force

To find the force of gravity (also known as weight) on the brick, we use Newton's second law of motion:

* Force (F) = Mass (m) x Acceleration (a)

1. Mass of the brick (m): 10 kg

2. Acceleration due to gravity (a): 9.8 m/s²

3. Force of gravity (F): 10 kg * 9.8 m/s² = 98 Newtons (N)

Therefore, the force of gravity on the 10kg brick in a vacuum is 98 Newtons.

Important Note: The mass of the book is irrelevant in this scenario because we're only interested in the force acting on the brick.