Which statement about brakes is true?

The statement that the heavier a vehicle or the faster it is moving, the more heat the brakes have to absorb to stop it is accurate. This is because the stopping power required to bring a vehicle to a halt is directly related to its momentum, which is the product of its mass and velocity. A heavier vehicle, or one moving at a higher speed, has greater momentum and therefore requires more force to stop.

As the brakes work to slow down or stop the vehicle, they convert the kinetic energy of the moving vehicle into thermal energy, leading to increased heat generation in the brake components. This is why it's crucial for brakes to be well-maintained and designed to handle the heat that comes from repeated or prolonged braking, especially in heavier or faster vehicles. The ability to absorb and dissipate this heat is vital for maintaining effective braking performance.