Please enable JavaScript.
Coggle requires JavaScript to display documents.
application of forces and transfer of energy(chapter 9) - Coggle Diagram
application of forces and transfer of energy(chapter 9)
non-contact forces
gravitational force and magnetic force
contact forces
friction and elastic force
we can measure forces with a spring balance
measure mass with electronic balance or beam balance
calculate pressure
Use Pa(pascal) which is N/m2
atmospheric pressure
drink straw: air is removed from straw and air pressure inside straw decrease and become lower than atmospheric pressure, higher atomospher pressure psuh liquid upward
Go to TB pg. 20 for more example
force SI unit is joule
energy conservation means that the total energy does not change as no energy can be lost or created
energy sources
fossil fuels
che in fossil fuel to heat energy(boiler) to KE(turbine) to EE(generator)
Release pollutants that contribute global warming and climate change
solar energy
LE(sun) to EE(solar cell)
Eco friendly but care is needed to dispose toxic waste of solar cell
hydroelectric energy
GPE(water stored behind dam) to KE(water) to KE(turbine) to EE(generator)
may cause loss of animals and kills plants and have environmental impact
wind energy
KE(wind) to KE(wind turbine) to EE(generator)
requires a lot of land and noise pollution, requires wind speed
geothermal energy
HE(inside earth) to KE(steam) to KE(turbine) to EE(generator)
kills habitats and may realese harmful things underground if not properly handled
biofuels
CPE(biofuel) to HE(vehicle engine) to KE(vehicle) through petrol
can be grown in short time but harmful for environment due to realese of CO2
nuclear energy
nuclear energy(atoms) to HE(nuclear reactor) to KE(turbine) to EE(generator)
creates a lot of energy but is not very safe
when atom is split, heat energy is realeased or through nuclear fission, type of nuclear reaction