Contact and non contact forces
What are contact forces?
A contact force is define as the force acting between two or more objects that come in contact with each other. Contact force can be divided into two orthogonal parts: normal which is perpendicular and frictional which is parallel to the surface. They can or cannot be natural.
SI unit of heat.
SI unit of temperature.
heat = joules
temp = kelvin
What are all the heat transfer methods? Explain how they transfer heat.
They are conduction, convection, and radiation. Conduction works through solids. Convection works through liquids. Radiation works through vacuums.
What is a thermometer?
A thermometer is a device used to measure heat energy. There are different types of thermometers such as liquid in glass (which uses alcohol), and electrical thermometers.
What are non contact forces?
Non contact forces are the forces that acts on the object without any physical interaction with them.
State the formulas for Celsius to Fahrenheit, Celsius to Kelvin, and Fahrenheit to Celsius.
(5/9)F - 32 = C
(9/5)C + 32 = F
C + 273 = K
Conduction works in two ways. State them and the formula's.
Name the 6 points of a mercury thermometer.
It has a high boiling point (357 C), It has a relatively higher melting point, It is a good thermal conductor, It expands regularly, It does not wet the glass, it is opaque.
What fields do contact forces use?
Trick question: they use vector fields.
What are the 3 scales used by temperature and what are their reference points.
They are Celsius, kelvin, and Fahrenheit. Celsius' reference point is water. Kelvin is based off the kinetic theory and Fahrenheit is based on brine or an equal ice/salt mixture.
Convection works in two ways. State them and give the formula.
Natural and forced are the two ways. Newton's law of cooling = -Q = hA(Ts - T(infinity))
Name the 6 points of a alcohol thermometer.
It has a low boiling point (78 C), It has a relatively low melting point, It is a poor thermal conductor, It expands irregularly sometimes, It does wet the glass, it is transparent and needs to be dyed.
What fields do non-contact forces use?
They use their own fields. Eg gravitational field, magnetic field.
What is heat? Give 4 descriptions of heat.
What is temperature? Give 4 descriptions of temperature
heat - The amount of energy that flows in a body, Total potential and kinetic energy contained by the molecules in an object, flows from hotter objects to cooler objects, its SI unit is joules.
Temperature - SI units of temp is kelvin, temperature determines direction of heat flow, is the average kinetic energy of the molecules in a substance, rises when heated lowers when cooled
Radiation has three steps. List them and explain them. Give the formula too.
Name all 5 points on a clinical thermometer.
It is scaled from 35 C to 42 C or from 94 F to 108 F, Mercury level does not fall on its own, Temperature can be read after removing the thermometer from armpit or mouth, to lower the mercury level, jerks are given, in clinical thermometers it is used on humans.
Name 5 noncontact and 5 contact forces.
Non contact - Gravitational, Electrostatic, magnetic, and nuclear.
What is the specific heat capacity of water?
It is 1.0 j/(kg*C)
Give an example of each type of heat transfer method.
idk you're probably correct.
Name 5 points on laboratory thermometer.
It is generally scaled from 10 C to 110 C or from 18 F to 198 f, the mercury level falls on its own, temperature is read while keeping thermometer in the source such as liquid or anything, in a laboratory no jerks are given because it sets itself, it is used to take the temperatures of different experiments.