How much does a car's disk breaks heat up when,

  • Thread starter Thread starter Northener
  • Start date Start date
  • Tags Tags
    Disk Heat
Click For Summary
SUMMARY

The discussion focuses on calculating the heat generated in a car's disk brakes when decelerating from 120 km/h to 80 km/h. It establishes that 50% of the kinetic energy lost during deceleration translates into heat absorbed by the brakes. Using the formula Q = cmΔT, where Q represents heat energy, c is the heat capacity (0.46 for steel), m is the mass of the disk brakes (11 kg), and ΔT is the temperature change, participants aim to determine the temperature increase in the brakes due to this energy conversion.

PREREQUISITES
  • Understanding of kinetic energy and its conversion to heat energy
  • Familiarity with the formula Q = cmΔT for heat transfer calculations
  • Basic knowledge of thermodynamics, particularly heat capacity
  • Concept of deceleration and its impact on energy loss in vehicles
NEXT STEPS
  • Research the principles of kinetic energy and its formulas
  • Study the specific heat capacity of various materials, focusing on metals
  • Explore advanced thermodynamic equations related to heat transfer in automotive systems
  • Investigate the effects of brake material composition on heat dissipation
USEFUL FOR

Automotive engineers, physics students, and anyone interested in vehicle dynamics and thermal management in braking systems.

Northener
Messages
1
Reaction score
0
Imaging a car decelerating from 120km/h to 80km/h. How much do the disk breaks heat up if 50% of the energy translates directly as heat (to the breaks). The car's mass is 1300kg and the full mas of the disk breaks are 11kg. The disks are made of steel Q=0.46 (heat capacity)

I've been using Ke formula and Q=cm¤T

¤ stands for ''difference in''. Not sure what the correct notation is.
 
Physics news on Phys.org
so you use the ke formula so find out the energy lost, you know that 50% of it translates to heat.

the other equation:
Q = cm \Delta T

Q is the heat energy that went into the break, c is the heat capacity, m is the mass of the disk, and \Delta T is the change in temperature of the break
 

Similar threads

How much time does it take to warm up water?
  • · Replies 15 ·
Replies
15
Views
2K
How much will my seaweed tanks heat up in the hot Indian summer?
  • · Replies 9 ·
Replies
9
Views
3K
Specific Heat and its relevance to Molecular Configuration
  • · Replies 1 ·
Replies
1
Views
5K
Heat Transfer by Nichrome wire and Steel
  • · Replies 20 ·
Replies
20
Views
6K
How much heat is needed to boil water on a camp stove?
  • · Replies 4 ·
Replies
4
Views
2K
How Does Latent Heat Affect Sweat Evaporation in Cooling the Body?
  • · Replies 3 ·
Replies
3
Views
5K
How Much Energy Is Lost When a Sledgehammer Hits a Stationary Merry-Go-Round?
  • · Replies 10 ·
Replies
10
Views
3K
How much current is needed in an inductor to heat up water?
  • · Replies 2 ·
Replies
2
Views
3K
How to apply the First Law of Thermodynamics to this problem?
  • · Replies 37 ·
2
Replies
37
Views
5K
Specific heat capacity (Calorimetry)
  • · Replies 5 ·
Replies
5
Views
6K