Physical Science by Marlon Kantor https://padlet.com/marlonkantor/qckntiqju6bo Interactive presentation - Ch 8 en-us 2017-11-11 16:46:48 UTC 2025-11-19 19:29:19 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Brightnessdown.png Work marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205902493 a form of energy that comes
from force applied over distance. A force of 1 newton does 1 joule of work when the force causes 1 meter of motion in the direction of the force.
]]> 2017-11-11 16:52:37 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205902493 Energy is needed to do work marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205902977 Recall that energy is always needed to do work. An object that has energy is able to do work; without energy, it is impossible to do work. The more energy you have, the more work you can do. For example, a ball rolling across a table has kinetic energy that can be used to do work. If the ball collides with a toy car, it will do work on the car and change its motion. Some of the ball’s kinetic energy is transferred to the car. Collision is a common method of doing work.]]> 2017-11-11 16:55:12 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205902977 Work against gravity marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903232 Work done against gravity is equal to weight multiplied by the change in height]]> 2017-11-11 16:58:00 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903232 Efficiency and Power marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903397 Work input :the work that is done
on an object.
Work Output :the work that an
object does as a result of work input.
]]> 2017-11-11 16:59:41 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903397 marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903575 The energy output of a process or machine can never exceed the energy input.]]> 2017-11-11 17:01:52 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903575 Efficiency marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903686 The ratio of usableoutput work divided by total input work. Efficiency is often expressed as a percent, with a perfect machine having 100 percent efficiency]]> 2017-11-11 17:03:01 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903686 Power marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903897 power :the rate of doing work or moving energy. Power is equal to energy (or work) divided by time.
watt (W) :a unit of power equal to 1 joule per second.
horsepower (hp) :a unit of power equal to 746 watts.
]]> 2017-11-11 17:05:31 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205903897 Energy in natural systems marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205904231 Energy drives all the processes in nature, from winds in the atmosphere to nuclear reactions occurring in the cores of stars. In the environment, efficiency is
interpreted as the fraction of incoming energy that goes into a process. For example, Earth receives energy from the sun. Earth absorbs this solar energy
with an average efficiency of 78 percent. The energy that is not absorbed is reflected back into space.
]]> 2017-11-11 17:09:19 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205904231 marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205904422 2017-11-11 17:11:25 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205904422 Work and Energy marlonkantor https://padlet.com/marlonkantor/qckntiqju6bo/wish/205931555 2017-11-12 00:04:30 UTC https://padlet.com/marlonkantor/qckntiqju6bo/wish/205931555