Match the following terms with their descriptions and answer the questions about pressure, force, and related concepts.

$$
P = \frac{10 \text{ N}}{0.018 \text{ m}^2}
$$
$$
P \approx 555.56 \text{ Pa}
$$
The pressure exerted by the pin is $\boxed{\text{555.56 Pa}}$.

6. Step 1: Assume the person's weight (force) is 120 N. Calculate the total area of contact when standing on two feet. Area under one foot $= 180 \text{ cm}^2$ Total area (A) $= 2 \times 180 \text{ cm}^2 = 360 \text{ cm}^2$

$$
P = \frac{120 \text{ N}}{0.036 \text{ m}^2}
$$
$$
P \approx 3333.33 \text{ Pa}
$$
The pressure exerted on the ground by the person is $\boxed{\text{3333.33 Pa}}$.

7. Step 1: Use the formula for pressure $P = \frac{F}{A}$. $P = \frac{23 \text{ N}}{46 \text{ m}^2}$ $P = 0.5 \text{ Pa}$ The pressure is $\boxed{\text{0.5 Pa}}$.

8. Atmospheric pressure decreases with altitude because as you go higher, there is less air above you. This means there are fewer air molecules to exert gravitational force, resulting in a lower weight of the air column and thus lower pressure.

HOTS

An inflated balloon bursts when pushed with a pointed pencil tip because the small contact area of the tip concentrates the force into a very high pressure, exceeding the balloon's strength. When pushed with a finger, even with greater force, the larger contact area distributes the force over a wider region, resulting in a much lower pressure that the balloon can withstand.

PROJECT WORK

This is a project activity. You need to collect pictures and create a collage, writing two sentences for each picture.

Life Skill

To fill the second container with an equal amount of water from the first, you would need a measuring cup to accurately transfer the water. Alternatively, if both containers are identical in shape and size, you could pour water from the first into the second until the water levels in both containers are equal.

Fun Time

This is a project activity. You need to make and explain a Torricelli Barometer on chart paper.