Science 7 exam review

The exam for both Science 7C and 7P will be on Wednesday, April 8th.  The exam is on Unit 2: Structures and Designs, Topics 1-4.

Pages in the textbook to re-read: p. 74-109

Study questions to complete: Checkpoint p. 110 #1-5

In addition to the Checkpoint questions, here are some terms and concepts to help you to study before the exam:

Key terms:

- structure

- design

- natural

- manufactured

- function

- technology

- materials

- properties

- stress

- load

- compression

- tension

- compressive strength

- tensile strength

- metal fatigue

- alloys

- beam

- cantilever

- orientation

- neutral axis

Additional study questions:

1.  List 10 examples each of manufactured and natural objects.

2.  Name three structures that serve the same function (list, and name the function).

3.  Describe how early human beings used simple structures to carry out basic functions.  How many can you brainstorm?  List them.

4.  Manufactured and natural objects often share similar designs.  What manufactured object has a design that may have been inspired by the spider web?  List as many other examples of manufactured and natural objects that share similar designs (i.e. kangaroo pouch/bunnyhug, mushroom/umbrella, bird/hang glider, etc.).

5.  Name two manufactured structures and two natural structures that are used for the function of digging.

6.  Describe why a train bridge made of plastic would not be a wise design decision.  Try to use the words materials, properties, stress, load, and compression/compressive strength in your answer.

7.  What must designers take into account when choosing the right materials to use for a structure?

8.  What will happen to a beam that is supported on both ends when it is put under stress?  Where is the tension?  Where is the compression?

9.  What will happen when a load is placed on a cantilever?  Where is the tension?  Where is the compression?

10.  Why are alloys often good material choices for structures?  What do they offer that single metals do not?

11.  How can a beam be strengthened so as to avoid bending or breaking under a load?  Draw a sketch of a strengthened beam.

12.  When a beam is placed on its narrow edge, what happens to the amount of load it can support?  Why?

13.  Explain why the amount of material along the neutral axis of a beam can be reduced without weakening the beam.  Why is reducing the material along the neutral axis beneficial to the structure?

Leave me a comment here if you have any questions or comments.  Happy studying! :o)