Benchmark Question: How do we manipulate simple machines
and make their parts work together?
Focus Question: How do simple machines work?
Using a hand can opener as
an example of a simple mechanical device, the teacher will ask students to
identify the simple machines it contains. Students will explain how the
simple machines work together to open a can.
Pairs of students will be
given a simple mechanical device to manipulate. Examples of simple
mechanical devices include bicycles, eggbeaters, and clothespins. Students
will identify the simple machine(s) in the machine and discuss how the
mechanical device works.
For example: An egg beater
contains a wheel and axle, gears, and wedges/blades. It works in the
1. Handle is turned
2. Wheel and axle are engaged
3. Gears turn
4. Wedges/Blades turn
5. Blades cut into and mix ingredients (eggs, flour,
sugar, etc) necessary to make cake batter
Each student will select a
mechanical device from a collection at the front of the room. He or she
will write a list of steps explaining how it works. He or she will present
a demonstration speech to the class.