Science/Strand IV/Content Standard 3/Elementary/Benchmark 5
Instructional Example

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 following way:

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.

Constructing: (SCI.I.1.E.1), (SCI.I.1.E.3).

Reflecting: (SCI.II.1.E.1), (SCI.II.1E.2), (SCI.II.1.E.4).

 

Science/Strand IV/Content Standard 3/Elementary/Benchmark 5
Assessment Example

The class will read or listen to Shel Silverstein’s “Homework Machine.” Each student will design a simple mechanical device for doing homework that uses at least three different simple machines. Each student will draw and label a diagram of his or her own homework machine. Each student will describe how the machine works in a paragraph, poem, or song.

(Give students rubric before activity.)

Scoring Rubric

Criteria

Apprentice

Basic

Meets

Exceeds

Completeness of design

Designs homework machine with one simple machine.

Designs homework machine with two different simple machines.

Designs homework machine with three different simple machines.

Designs homework machine with more than three simple machines.

Accuracy of explanation

Identifies simple machines incorrectly and provides little or no explanation.

Identifies simple machines correctly but may not be able to explain how they work together.

Identifies simple machines correctly and explains how some of them work together.

Identifies simple machines correctly and explains how all of them work together.