A brick weighing 2 kg falls from a height of 10 m. What force does the work when the brick falls? What is this work?

m = 2 kg.

g = 9.8 m / s2.

h = 10 m.

∠α = 0 °.

A -?

Mechanical work A is called a scalar physical quantity equal to the product of the force F, which acts on the body, on the movement of the body S under the action of this force, and on the cosine of the angle between them: A = F * S * cosα.

When falling on a brick, only gravity acts, which is directed vertically downward: F = m * g.

The movement of the brick S is also directed vertically downward and is numerically equal to the height of the fall h: S = h.

∠α = 0 °, cos0 ° = 1.

The formula for determining the work will be: A = m * g * h.

A = 2 kg * 9.8 m / s2 * 10 m = 196 J.

Answer: when a brick falls, gravity does work A = 196 J.