Year 7 Science · Unit 3 · Lesson 8
Foundation Worksheet
Learning Goals
Fill the gap
Choose the correct word from the word bank to complete each sentence. Two words will not be used.
is the effect of a spread over an area. When the same force acts on a area, the pressure is higher — the force is more concentrated. When the same force acts on a area, the pressure is lower — the force is spread out. have a large contact area, so a person's weight creates low pressure and they don't sink into soft snow. A heel has a very tiny contact area, so even a light person creates enormous pressure on a wooden floor.
Odd one out
Circle the item that does not belong in each group. Then explain why it doesn't fit using the concept of pressure.
| # | Group | Your answer (odd one + reason) |
|---|---|---|
| 1 | Snowshoes Wide tractor tyre Stiletto heel Camel's flat hoof | |
| 2 | Sharp knife edge Drawing pin point Nail tip Elephant's flat foot | |
| 3 | Building foundation Dam wall thicker at base Pointed stiletto heel Wide raft on a lake |
1. A drawing pin has a flat head and a sharp point. When you press it into a wall, which end goes in — the flat head or the sharp point? Use the word "pressure" and "area" in your explanation.
2. A 60 kg person wearing stiletto heels can sink into a soft lawn, but a 3000 kg elephant does not. Using what you know about pressure and area, explain how this is possible.
Wrap Up
In one sentence, what was the main idea of this lesson?