Ch1 Types of Systems
Systems that rely on a group of physical parts to perform a function. They can be natural or human-made.
What is a physical system?
A simple machine that makes pulling loads easier. Causes turning motions in many physical systems. Can be seen in water wells, or bicycles.
What is a pulley?
A simple machine that consist of a fulcrum, load arm, and effort arm.
What is a lever?
Any push or pull on an object that may result in a change in the object's motion or shape.
What is a force?
The formula for Work.
What is W=Fxd?
A group of organisms working together to perform a task.
What is a social system?
A simple machine consisting of a round disc attached to a rod.
What is a Wheel & Axle?
A pair of scissors is a _________ class lever.
What is a first class lever?
The type of force that pulls objects toward the Earth's surface.
What is gravity?
The ratio of output force to input force for a given machine.
What is mechanical advantage?
A bee colony or coyote pack is a ____________ social system.
What is natural?
A simple machine that consists of a tilted, flat surface. Used to move loads to a higher level.
What is an inclined plane?
The class lever with the fulcrum in middle.
What is a first class lever?
The unit we use to measure forces.
What is a Newton?
The units used to measure Work.
What is Newton-metre or Joules?
Undesired outputs in a system. Example, car pollution.
What are side effects?
A simple machine, thats purpose is to hold things together. (It has threads)
What is a screw?
The class lever with the effort in the middle.
What is a third class lever?
The type of force that occurs when one surface or object rubs against another.
What is friction?
The formula for actual mechanical advantage.
What is MA=output force/input force?
Involves "thinking" about how parts of a system work together.
What is system thinking?
A simple machine that is a modified inclined plane. Its purpose can be for splitting, or tightening.
What is a wedge?
The class lever with the load in the middle.
What is a second class lever?
Two components to represent forces.
What is magnitude and direction?
________: The ability to do work.
(Hint: topic of last lesson)
What is energy?