Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Density and Pressure
72 practice questions
Topics covered
Practice questions
11–20 of 36 · Normal
Question 11
3 marks · Normal
Answer and see the solution →A metal plate rests on soft ground. The plate has a weight of 600 N and covers an area of 0.75 m².
(a)[2 marks]Calculate the pressure the plate exerts on the ground. Give your answer in Pa.
(b)[1 mark]Explain how the pressure would change if the area of the plate were halved, but the weight stayed the same.
Question 12
2 marks · Normal
Answer and see the solution →Explain, using the pressure equation, why a sharp knife is easier to use for cutting than a blunt knife.
Question 13
3 marks · Normal
Answer and see the solution →Describe a practical method for measuring the pressure that a student's shoe exerts on the ground.
Question 14
1 mark · Normal
Answer and see the solution →Which of these will result in the greatest pressure exerted on the ground?
Force (N) Area (m²) 400 0.5 250 0.2 800 2.0 120 0.1 - A.400 N, 0.5 m²
- B.250 N, 0.2 m²
- C.800 N, 2.0 m²
- D.120 N, 0.1 m²
Question 15
2 marks · Normal
Answer and see the solution →A gardener stands on soft ground with both feet, exerting a total force of 700 N downwards. The combined area of both boots in contact with the ground is 0.36 m². Calculate the pressure exerted on the ground. Give your answer to 2 significant figures.
Question 16
4 marks · Normal
Answer and see the solution →A rectangular block of wood has a mass of 4.5 kg. It is placed flat on the ground so that it touches the floor with its largest face. The area of this face is 0.3 m².
(a)[1 mark]Calculate the weight of the block. (Take g = 10 N/kg.)
(b)[2 marks]Calculate the pressure the block exerts on the ground. Give the unit.
(c)[1 mark]If the block is stood on its smallest face of area 0.05 m², calculate the new pressure exerted on the ground.
Question 17
1 mark · Normal
Answer and see the solution →State what is meant by 'pressure at a point acts equally in all directions in a liquid at rest'.
Question 18
4 marks · Normal
Answer and see the solution →A deep-sea diver is submerged at a certain depth in a stationary sea. The pressure at the diver's position is measured in three directions: upwards, downwards, and horizontally.
(a)[2 marks]Explain why the pressure at a point in a stationary liquid is the same in each of these directions.
(b)[2 marks]If the diver is not moving and the water around them is stationary, what would you expect a pressure gauge to read if pointed in any of these three directions at the same point? Explain your answer.
Question 19
4 marks · Normal
Answer and see the solution →Figure 1 shows a metal can with several small holes at the same height, positioned around its base. The can is filled with water and the streams of water coming from each hole are observed.
Can with holes demonstrating liquid pressure. (a)[1 mark]Describe what will be observed from the holes when the can is filled with water.
(b)[3 marks]Explain how this experiment shows that pressure in a liquid acts equally in all directions at a certain depth.
Question 20
1 mark · Normal
Answer and check →Which statement is correct about the pressure inside a stationary gas contained in a sealed box?
- A.The pressure is the same in all directions at a point.
- B.The pressure is greater upwards than downwards.
- C.The pressure only acts downwards due to gravity.
- D.The pressure is zero at the sides.