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4 work and energy - Coggle Diagram
4 work and energy
4.1 work is the use of force to move an object.
force is necessary to do work.
force, motion and work.
work is only done when the thing moves.
calculating work.
work = force * distance w=fd.
work is a measure of force that Is applied over a certain distance.
object is that are moving can do work.
work is when you pick or push something, this is when you do the work but objects can also do the work.
4.3 power is the rate at witch work is done.
power can be calculated from work and time.
when you lift something you increase your power.
calculating power from work.
power = work/time p=w/t.
power over a long period of time.
house power.
house power is a unit.
power can be calculated from energy and time.
you can not directly measure the energy being tranfered.
calculating power from energy.
4.2 energy is transferred when work is done.
work transferred energy.
when you throw a ball you transfer energy.
work changes potential and kenktic energy.
when you throw a ball you give it kinetic energy, the faster it moves the more kinetic energy it has. when you pick the ball up you give it potential energy.
calculating gravitational potential energy.
gravitational potential energy = mass
gravitational acceleration
height GPE = mgh.
potential energy is caused by gravity.
calculating kinetic energy.
when you swing on a swing you get kinetic energy.
kinetic energy = mass*velocity^2/2 Ke 1/2 mv^2.
calculating mechanical energy.
mechanical energy = optical energy + kinetic energy me = pe + ke.
the total amount of energy is constant.
energy can change form but it can not be created or destroyed.
conserving mechanical energy.
energy is lost to friction.
losing mechanical energy.
when something moves it loses energy.
forms of energy.
thermal energy, chemical energy, nuclear energy, electromagnetic energy.