Tech 2

Question 1

Look at the photograph of an emergency shelter.

1. Give 2 strengths of this design.
2. Give 1 weakness of this design.

Answer 1

Strengths:

1. It is a rounded shape that makes it aerodynamic.
2. It is spacious.

Weakness:

1. It is not well insulated for cold weather.

Question 2

Name 2 magnetic objects

Answer 2

1. Metal paper clip
2. Iron beam

Question 3

What is an electromagnet?

Answer 3

An electromagnet is a magnet formed when an electrical current is passed through a coil that has been wound around an iron bar.

Question 4

Is the sketch in the figure an example of a pulley or a crank?

Answer 4

A crank

Question 5

You have asked some companies to design and make a model of a crane that will pick up metallic objects.

1. Write a design brief to give to companies.

Answer 5

• Design and make a model of a crane that uses an electromagnet to pick up metallic objects.

Question 6

You have asked some companies to design and make a model of a crane that will pick up metallic objects.

1. Write 3 specifications for this task.

Answer 6

1. The crane will be used to separate metallic objects from non-metallic objects.
2. The crane must be stable and strong. Triangulation must be used.
3. The crane must have an electromagnet to pick up metallic objects.

Question 7

You have asked some companies to design and make a model of a crane that will pick up metallic objects.

• List 5 criteria you will use to evaluate these models.

Answer 7

1. The crane must be strong.
   * Triangulation and tubing must be used.
2. The crane must be stable.
   * The base-size should be wider than the top.
3. An electromagnet needs to be at the end of the crane
   * to pick up metallic objects
4. The crane must be a frame structure.
5. The crane should be able to move in some way
   * so it can move around to different areas.

Question 8

Name the 3 layers of the protective clothing that fire fighters wear and give the purpose for each layer.

Answer 8

1. Outer shell
   * Protects the fire figther from heat and flames.
2. Moisture barrier

• Allows body moisture such as sweat to be released
• Protects the fire fighter from very hot water

3. Thermal barrier
   * Provides protection against the heat.

Question 9

What is on the protective clothing of a fire fighter that enables them to be seen in smoky conditions?

Answer 9

Reflective strips.