* Gravity and Mass: The force of gravity on an object depends directly on its mass. The more massive an object, the stronger the force of gravity acting on it.

* Vacuum: In a vacuum, there's no air resistance, so both the brick and the book will fall at the same rate.

To find the force of gravity on the 10kg brick, we need more information:

* Acceleration due to gravity (g): The standard acceleration due to gravity on Earth is approximately 9.8 m/s².

Here's how to calculate the force:

1. Newton's Second Law: Force (F) = Mass (m) * Acceleration (a)

2. Substitute: F = 10 kg * 9.8 m/s²

3. Result: F = 98 Newtons (N)

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