If a piece of meatal were rubbed against a piece of wood,which would become hotter?Why?Can anyone help ?pls.?

Answer 1

The metal would, it is a better conducter of heat that wood.

Answer 2

It's impossible to say without more information.

I'll assume you keep rubbing them together until the system reaches "steady state" where the temperature is no longer changing. That final temperature in each piece of material will depend upon how much energy you are adding to each material through the rubbing, and how rapidly energy is being carried away from the point of friction.

The energy added to each material is the same. In favor of the wood being hotter is that energy is carried only slowly through the wood, meaning that the temperature at the point of rubbing would be much higher before there is enough heat transfer for the system to reach steady state. In favor of the metal being hotter is that the metal, generally speaking, has a lower specific heat capacity, meaning that a unit of energy heats up more metal than wood.

On balance, I think the superior heat transfer of the metal would win out, and the steady state temperature of the metal would be lower than the wood. Without an entire host of specific data, that would be just a guess.

Answer 3

Neither would "get hotter". The heat is created by the friction. Temperatuer is average kinetic energy. Both would heat up the same at the impact point. The metal would conduct the heat better than the wood so if you rubbed a wood brick vs a metal brick I think you would feel the heat on the outside of the metal brick before the outside of the wood brick. But the wood brick would also start buring at the impact point, rather than conducting the heat.

Answer 4

Simple physics, friction is the answer.

The metal has a higher tolerance and would require longer exposure to a rubbing surface in order to generate the heat that would turn it hot....see Energy coefficient.

As your other answer states that metal is a better conductor you should relize that this means it would bleed off heat also very quickly.
Given that wood is burned and the coals inflamed with air to burn it faster and hotter in order to melt metal you can see that wood due to friction from the metal would heat up faster and become hotter first.

Don't forget trick questions, details are missing, type of wood and metal, duration of rubbing as well as how the rubbing is applied, by hand or machine.
Would you use a thermal probe to obtain test results?
Good luck.

Answer 5

Every time of rubbing we expend energy having done work against friction.

The energy converted into heat are taken by both the surfaces; but the heat is conducted through out the metal quickly, whereas in the case of wood it resides on the surface of the wood due to its poor conductivity.

But the specific heat capacity of wood is enormously high. Hence for small amount of heat the temperature of metal rises quickly than that in wood. But both being in contact tries to get thermal equilibrium. Thus both the metal surface and wooden surface will have the same temperature.

But from the contact surface to the other surfaces of the metal there will be a temperature gradient. The gradient will be small. That is ‘the fall of temperature will be small’. That is to say they will be almost the same.

But in the case of wood the temperature of the contact surface will be high (of course equal to that of metal surface) and the temperature gradient will be very deep. The fall of temperature with in a few distances will be very great.

Answer 6

wood become more hotter . because coofecient of heat trasfer of wood is very smaller than metals . then heat acomolate at the surface of wood.

Answer 7

the metal would be hotter has it has free moving electrons which can conduct more heat and electricity.

after some time i will also give u a site which will tell u more about it.

Answer 8

HEAT GAINED BY THE HOT BODY IS EQUAL TO THE HEAT LOST BY THE COLD BODY

Answer 9

I have'nt seen the answers yet but one of them has to be...hey ! try it.