Physical Science by Marlon Kantor https://padlet.com/marlonkantor/bb5p1if6ur5t Ch 9 en-us 2017-11-11 17:18:59 UTC 2023-12-22 04:03:57 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Thunder.png Machines marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205905337  Machine: a device with moving parts that work together to accomplish a task.
 Input: forces, energy, or power supplied to make a machine accomplish a task.
Output: forces, energy, or power provided by the machine.
]]> 2017-11-11 17:22:06 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205905337 Simple Machines marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205905467 Simple machine :an unpowered
mechanical device that accomplishes a task with only one movement.

lever :a stiff structure that rotates
around a fixed point called a fulcrum.

gear: a rotating wheel with teeth that transfers motion and forces to other gears or objects.
]]> 2017-11-11 17:24:15 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205905467 What do simple machines do for us? marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205905655 A simple machine does work because it applies a force over a distance. If you are using the machine, you also do work, because you apply force to the machine to make it move. By definition, a simple machine has no source of energy except the immediate forces you apply. That means the only way to
get output work from a simple machine is to do input work on the machine.
]]> 2017-11-11 17:26:42 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205905655 Mechanical advantage marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205905872 Mechanical advantage
is the ratio of output force to input force. If the mechanical advantage is greater than 1, the output force is bigger than the
input force
A mechanical advantage less than 1 means the output force is smaller than the input force. What does it mean when mechanical advantage equals 1? In this case, the output force equals the
input force
]]> 2017-11-11 17:29:06 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205905872 Lever marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906111 Lever: a stiff structure that rotates around a fixed point called a fulcrum.
 
]]> 2017-11-11 17:32:05 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906111 Classes of Levers marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906146 2017-11-11 17:32:33 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906146 Gears marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906433 Gears can transfer motion and force when the teeth of one gear press on the teeth of another gear as each gear rotates around a shaft.

]]> 2017-11-11 17:35:38 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906433 Gear Ratio marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906604 The gear ratiois the ratio of output turns to input turns. The gear ratio canalso be calculated as the ratio of the number of teeth on the input gear versus the number on the output gear. The mechanical advantage of a pair of gears
is the inverse of the gear ratio
]]> 2017-11-11 17:37:37 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906604 Rope and pulley systems marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906847 Tension in ropes
and strings .Ropes and strings carry tension
forces along their length. The tension is the same at every point in a rope. If the rope is not moving, its tension is equal to
the force pulling on each end (below). Ropes or strings do
not carry pushing forces
]]> 2017-11-11 17:40:22 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205906847 Ramps, wedges, and wheels marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205907547 2017-11-11 17:47:33 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205907547 Levers in the Human Body marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205908123 The human body is a complex machine that includes a number of simple machines—levers. Levers provide the body with the ability to accomplish tasks. Your arms and legs, for example, work as levers to move and lift objects. In the last section, you learned that there are three classes of levers. Your limbs are examples of third class levers]]> 2017-11-11 17:54:34 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205908123 Levers from Head to Foot marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205908302 Like your arms and legs, your lower jaw is a lever. However, the lower jaw can work both as a second class and as a third class lever.]]> 2017-11-11 17:56:26 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205908302 Joints and Levers in the Human Body marlonkantor https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205931673 2017-11-12 00:08:03 UTC https://padlet.com/marlonkantor/bb5p1if6ur5t/wish/205931673