10 (a) A donkey has a weight of 2500 N - Edexcel - GCSE Physics - Question 10 - 2022 - Paper 1

A camel's hoof is wider and larger compared to a donkey's hoof. This larger surface area helps in distributing the weight of the camel over a broader area, reducing the pressure exerted on the soft ground. In contrast, a donkey's hoof, being smaller, exerts greater pressure on the ground, making it more likely to sink into soft surfaces. Therefore, the shape of the camel's hoof is advantageous for walking on sandy or soft terrains.

To plot the missing points:

1. Identify the depths and their corresponding pressures from the provided table.
2. For each depth:
   • At 0.150 m depth, pressure is 100.15 kPa.
   • At 0.300 m depth, extrapolate based on the trend of the graph, estimated around 101.10 kPa.

Mark these points on the graph in their respective positions.

Drawing a line of best fit involves analyzing all plotted points and sketching a line that best represents the trend of the data without intersecting all points. The line should indicate a linear relationship, reflecting the general increase in pressure with depth in the water.

To predict the pressure at the surface of the water, look at the graph in Figure 27 and observe the y-axis at depth 0.000 m. The pressure value can be estimated from the plotted data, and it should be close to 99.15 kPa, as inferred from the linear trend.

When comparing the graph for seawater with the freshwater graph in Figure 27, you will likely notice that seawater exhibits higher pressure readings at the same depths due to its greater density. This results in a steeper slope on the graph for seawater compared to freshwater. The difference in pressure readings highlights the impact of fluid density on pressure measurements at various depths.