St. John’s Road Primary School
Technology
Grade 7
PAT
Term 3
Educator: C. Eastrace
Educator Signature: ______________
Moderator: N. Mamse
Moderator Signature: _____________
Name: _________________________________ Grade:7____
Possible
Mark
Design brief and
Investigate specification
(15 marks)
Investigate cranes
Design
(20 marks)
Learners’
Mark
5
10
Circuit diagram
10
Oblique drawing
10
Make
Presentation
(35 marks)
35
Total
70
1
Scenario
A scrap metal dealer needs to sort magnetic and non-magnetic metals into separate piles for
recycling. They use a crane with a magnet but find it difficult to remove the metal pieces from the
magnet. They need a magnet that can be switched on and off to help with this.
The company wants you to design and build a model crane that:
• must be a simple frame structure,
• must be strong and stiff
• must be reinforced through triangulation
• uses a winch, a cable, and pulleys to lift and lower the arm
The company wants you to build an electromagnet that:
• must be attached to its arm,
• must have a switch so that it can be switched on and off, and
• must be strong enough to pick up several steel paperclips
Investigate
1. Design brief and specifications
[5]
1. Identify the design aspects:
a. What is it? (what is needed?)
………………………………………………………………………
b. Who it is for?
…………………………………………………………………………………………
c. What it is for?
………………………………………………………………………………………..
2. By making use of the above design aspects, complete the design brief.
(3)
Design and make a …………………………………………………………..………(what is needed)
for a ……………………..…………………………………………………………….. (who is it for) that
…………………………………………………………………………..….……………(what is it for).
3. List 2 of the specifications.
(2)
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
2
3
2. Investigate cranes
[10]
Identify winches and pulleys
Look at the four pictures of cranes below. Each crane has a winch and one or more pulleys.
1. Copy all four crane pictures onto the next page. Do not trace them. Make freehand sketches.
(4)
2. Look at where the winches are placed. Mark each winch with the letter W.
(½x4=2)
3. Look at where the pulleys are placed. Mark each pulley with the letter P.
(½x6=3)
4. Which of the cranes have pulley systems with two or more pulleys?
(1)
……………………………………………………………………………………………………
4
A
B
C
D
5
Design
1. Circuit diagram
[10]
Draw a circuit diagram in the space below for the for the electromagnet using your pencil and ruler.
Your circuit diagram must include the following:
•
• a cell
•
• a switch
•
• a bulb (to show when it is on)
•
• an electromagnet
6
2. Oblique drawing
[10]
Complete the oblique drawing of a crane below. Use a pencil and ruler.
Make
As a group, present to the class by means of a demonstration how your model works. Each
member must participate in the presentation.
(35)
Assessment rubric for presentation of
model
Poor
0-1
Adequate Good
2-3
4-5
Model is a frame structure
Model uses triangulation for reinforcement
Working electromagnet attached to the arm
Model has a switch
Picks up several paperclips
All members participate in presentation
Demonstration is of a good standard
Total:
_____/35
7