Student Unit E2
Work and Machines
Unit E2 Focus Words
machine
noun – a device that changes the magnitude or direction of a force
How is a lever a machine?
work
noun – energy transferred by force acting over a distance
Work is calculated by multiplying force and distance. What unit describes work? (It starts with a “J.”)
lever
noun – a machine that has a rigid fixed beam and a fulcrum
How is a baseball bat a lever? How about a wheelbarrow?
exert
verb – to apply or put forth
When you kick a ball, you exert a force upon it. What are other sports examples of exerting force?
apply
verb – to exert, to implement
Do you apply more effort to your friendships or hobbies? Explain.
load
noun – a weight or source of pressure
How does moving the fulcrum on a lever affect the load?
force
noun – a push or pull on an object
Explain how the force of gravity is a major factor in the way our planet orbits the Sun.
effort
noun – a force exerted by a machine (or human)
How do the locations of the effort, load, and fulcrum determine the class of lever?
specifications
noun – a description of the design and materials of a system
The specifications of how to build bombs and other illegal items are on the internet. Do you think posting such information should be illegal?