physics transferring energy Flashcards
whats energy
Energy is stored or transferred by almost all objects; our energy all originated from the Sun.
magnetic
magnetic domains inside a magnetic material that create a field;
thermal
a hot object stores more thermal energy;
kinetic
(movement) – a substance may be made of vibrating particles;
Sometimes we refer to a system’s INTERNAL energy.
chemical
energy is stored in the bonds between atoms in a molecule;
electrostatic
charged particles in an electric field;
elastic potential
in stretched springs, rubber bands, etc;
gravitational potential
the higher an object is, the more GPE it has;
nucleur
stored within the nucleus of an atom.
mechanical
this includes kinetic energy, GPE and EPE
electriacl
tiny charged particles flowing around a circuit;
heating
transfer of thermal energy from one place to another;
radiation
energy may be transferred in waves of light or sound.
whats a machine
A machine is a device that can convert one type of energy to another.
This can be represented by a simple energy flow diagram:
what is the measurement for energy transfer
joules
finish the word All fuels, including the food we eat, store _________ energy.
chemical
When we eat food, the chemical energy is transferred to our bodies, where the energy is stored until we need it.
When we eat food, the chemical energy is transferred to our bodies, where the energy is stored until we need it.
finish the word When fuels are burned, the chemical energy is released as _____ and ________ energy
light and thermal
We can compare fuels and foods by burning them and use the thermal energy to heat some water.
The greater the temperature increase, the more energy there is in the fuel.
We can compare fuels and foods by burning them and use the thermal energy to heat some water.
The greater the temperature increase, the more energy there is in the fuel.
slide 16
slide 16
A boiling tube was clamped at an angle, and 20cm3 of water were added; the initial temperature of the water was recorded. A small piece of food, held on a pin, was set alight, and immediately placed under the boiling tube. When the food had stopped burning, the final temperature of the water was recorded. The method was repeated for a selection of different foods.
A boiling tube was clamped at an angle, and 20cm3 of water were added; the initial temperature of the water was recorded. A small piece of food, held on a pin, was set alight, and immediately placed under the boiling tube. When the food had stopped burning, the final temperature of the water was recorded. The method was repeated for a selection of different foods.
whats energy density
The energy density of a fuel is a measure of how much energy the fuel provides per unit of its mass (ie, how many joules provided per gram of fuel).
example of energy density
1kg of uranium (used in nuclear power stations) provides as much energy as 20000kg of coal, therefore uranium has a much higher energy density.
slide 23
slide 23
