(c) A moving train has a kinetic energy of 8.1 x 10(power of 6)J.
The train makes an emergency stop.
It decelerates to rest in a distance of 270 m.
(i) Calculate the average friction force provided by the brakes.
answer

Respuesta :

the friction force provided by the brakes is 30000 N.

What is friction force?

Friction force is the force that opposes the motion between two bodies in contact.

To calculate the average friction force provided by the brakes, we apply the formula below.

Formula:

  • K.E = F'd............. Equation 1

Where:

  • K.E = Kinetic energy of the train
  • F' = Friction force provided by the brakes
  • d = distance

Make F' the subject of the equation

  • F' = K.E/d............ Equation 2

From the question,

Given:

  • K.E = 8.1×10⁶
  • d = 270 m

Substitute these values into equation 2

  • F' = (8.1 ×10⁶)/270
  • F' = 30000 N

Hence, the friction force provided by the brakes is 30000 N

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