A car weighing 10 tons moves along the road at an angle of 10 degrees to the horizon.

A car weighing 10 tons moves along the road at an angle of 10 degrees to the horizon. Find the work of gravity on a 100m path.

The work of the force that is applied to the material point is equal to the product of this force times the displacement and the cosine of the angle between the vector of displacement and the applied force, i.e .:

A = F * S * cos A.

According to Newton’s second law, gravity is:

F = m * a = m * g, g = 9.8 m / s².

Angle A = 90 ° – 10 ° = 80 °.

In total, the work of force will be equal to:

A = m * g * S * cos 80 ° = 10000 * 9.8 * 100 * cos 80 ° = 1 701 752 J = 1.7 MJ.

Answer: A = 1.7 MJ.