Chapter P1- Conservation and dissipation of energy Flashcards
What are the nine forms of energy?
What’s the formula for calculating gravitational potential energy (GPE)?
What’s the gravitational field strength on earth?
What three words can describe how energy be made into something?
What’s the formula for calculating kinetic energy (KE)?
What two things affect the amount of kinetic energy?
What’s the law of conservation of energy?
Kinetic, gravitational potential, heat (thermal or internal energy), sound, electrical (and magnetic), chemical potential, elastic potential, light and nuclear.
Mass (kg)✖️change in height (m)✖️gravitational field strength (N/kg).
10N/kg of mass.
Changed, converted or transformed.
KE=1/2✖️mass✖️speed2 (squared).
Can also be simplified as 1/2MV2.
Mass and speed.
A scientific law stating that energy can be transferred usefully, stored or dissipated (spread out), but cannot be created or destroyed.
What’s does mass mean?
What does weight mean?
What’s energy measured in?
What’s velocity measured in and what is it?
What theoretically would happen concerning GPE and KE if there’s no wasted energy?
What would be the formula for this?
What’s the formula for calculating height?
What’s the formula for calculating acceleration?
What’s the formula for calculating mass?
How heavy something is (measured in grams or kg).
The amount of force pushing on an object depending on the gravitational field of a planet.
Joules (J).
Speed (m/s).
GPE=KE
G✖️H= 1/2V2 (V squared).
Height= V2➗2G( gravational field strength).
Acceleration= change in speed➗time.
Mass=weight➗gravitational force.
What’s gravitational potential energy?
What’s efficiency?
What are the two formulas for calculating efficiency?
What’s the formula to calculate energy efficiency in percentage?
What are the nine different types of energy resources?
What’s work?
What does work tell you?
What’s the formula for calculating work?
The energy stored in an object due to its position.
Tells us how well a device is transferring input energy into useful energy.
Efficiency=useful output energy ➗total energy input (J).
Efficiency=useful power output➗total power input (Watts).
Useful energy output➗total energy input✖️100.
Solar, wind, tidal, wave, geothermal, biofuel, hydroelectric, fossil fuels, nuclear.
When an object is moved by a force, work is done on the object.
The amount of energy transferred.
Work done=force applied✖️distance travelled.
What’s the formula for calculating weight?
What’s power?
What’s the formula for calculating power?
What’s elastic potential energy?
What’s the formula for calculating elastic potential energy?
Weight=Mass✖ gravitational field strength.
a measure of how much energy is transferred per second.
Power (Watts)=energy transferred to an appliance(Joules, J)➗time take for energy to be transferred (seconds,s).
When we stretch a material such as an elastic band or a spring work is done due to the material and energy is stored in it.
Elastic potential energy (J)= 1/2 X spring constant (N/m) X extension squared (m2).
What is useful energy?
What is wasted energy?
What two things can happen to all the energy transferred?
Energy transferred to where it’s wanted in the way that it’s wanted.
Energy that’s not usefully transferred.
It either dissipates or is transferred usefully.
