Pressure practice exercise 1

The diagram below shows a perfume bottle. When the pump button is pressed, perfume is sprayed out as a fine mist. Explain how the design of the spray bottle uses the principle of pressure in liquids to work. (2 marks)

The diagram below shows a perfume bottle. When the pump button is pressed, perfume is sprayed out as a fine mist. Explain how the design of the spray bottle uses the principle of pressure in liquids to work. (2 marks)

A large wooden crate weighing 1,800 N rests on a flat surface with a contact area of 0.9 m². A worker tilts the crate so that it rests on one of its edges with a contact area of 0.2 m². Calculate the change in pressure exerted on the floor and explain the effect on the floor surface.  (4 marks)

A large wooden crate weighing 1,800 N rests on a flat surface with a contact area of 0.9 m². A worker tilts the crate so that it rests on one of its edges with a contact area of 0.2 m². Calculate the change in pressure exerted on the floor and explain the effect on the floor surface.  (4 marks)

A large wooden crate weighing 1,800 N rests on a flat surface with a contact area of 0.9 m². A worker tilts the crate so that it rests on one of its edges with a contact area of 0.2 m². Calculate the change in pressure exerted on the floor and explain the effect on the floor surface.  (4 marks)

A large wooden crate weighing 1,800 N rests on a flat surface with a contact area of 0.9 m². A worker tilts the crate so that it rests on one of its edges with a contact area of 0.2 m². Calculate the change in pressure exerted on the floor and explain the effect on the floor surface.  (4 marks)

Two tanks are filled to the same depth of 2 m — one with fresh water (density 1000 kg/m³) and the other with salty water (density 1025 kg/m³). Which tank has greater pressure at the bottom and why? (2 marks)

Two tanks are filled to the same depth of 2 m. One with fresh water (density 1000 kg/m³) and the other with salty water (density 1025 kg/m³). Which tank has greater pressure at the bottom and why? (2 marks)

Two tanks are filled to the same depth of 2 m. One with fresh water (density 1000 kg/m³) and the other with salty water (density 1025 kg/m³). Which tank has greater pressure at the bottom and why? (2 marks)

Two tanks are filled to the same depth of 2 m. One with fresh water (density 1000 kg/m³) and the other with salty water (density 1025 kg/m³). Which tank has greater pressure at the bottom and why? (2 marks)

A dam is filled with water to a height of 40 m. Calculate the pressure at the base of the dam if the density of water is 1000 kg/m³ and g = 9.8 N/kg. Give your answer in both Pascals and N/m². (2 marks)

A dam is filled with water to a height of 40 m. Calculate the pressure at the base of the dam if the density of water is 1000 kg/m³ and g = 9.8 N/kg. Give your answer in both Pascals and N/m². (2 marks)

A diver swimming in Lake Naivasha feels more pressure as they go deeper. Which factor is responsible for this?

A diver swimming in Lake Naivasha feels more pressure as they go deeper. Which factor is responsible for this? (1 mark)

A diver swimming in Lake Naivasha feels more pressure as they go deeper. Which factor is responsible for this? (1 mark)

A water tank in Kisumu is placed 10 m above the ground. If a tap is opened at ground level, why does water flow out with high speed?

A water tank in Kisumu is placed 10 m above the ground. If a tap is opened at ground level, why does water flow out with high speed? (1 mark)

A water tank in Kisumu is placed 10 m above the ground. If a tap is opened at ground level, why does water flow out with high speed? (1 mark)

Refer to the diagram of a water tank below. Why is the tap placed at the bottom of the tank?

The diagram below shows a water tank. Why is the tap placed at the bottom of the tank? (1 mark)

The diagram below shows a water tank. Why is the tap placed at the bottom of the tank? (1 mark)

A deep-sea diver near Mombasa reports difficulty in breathing as they go deeper underwater. Which explanation best fits this observation?

A deep-sea diver near Mombasa reports difficulty in breathing as they go deeper underwater. Which explanation best fits this observation? (1 mark)

A deep-sea diver near Mombasa reports difficulty in breathing as they go deeper underwater. Which explanation best fits this observation? (1 mark)

Why is it important for surgical tools like scalpels used in Kenyan hospitals to be designed with very sharp edges?

Why is it important for surgical tools like scalpels used in Kenyan hospitals to be designed with very sharp edges?  (1mark)

Why is it important for surgical tools like scalpels used in Kenyan hospitals to be designed with very sharp edges?  (1mark)

Why is it important for surgical tools like scalpels used in Kenyan hospitals to be designed with very sharp edges?  (1 mark)

A weather forecaster observes falling atmospheric pressure in a region. What is likely to happen?

A weather forecaster observes falling atmospheric pressure in a region. What is likely to happen? (1 mark)

A weather forecaster observes falling atmospheric pressure in a region. What is likely to happen? (1 mark)

A school in Eldoret has an overhead tank placed 8 metres above the ground. When a tap connected to the tank is opened at ground level, water gushes out quickly. Which principle of liquid pressure explains this?

A school in Eldoret has an overhead tank placed 8 metres above the ground. When a tap connected to the tank is opened at ground level, water gushes out quickly. Which principle of liquid pressure explains this? (1 mark)

A school in Eldoret has an overhead tank placed 8 metres above the ground. When a tap connected to the tank is opened at ground level, water gushes out quickly as shown in the image below. Which principle of liquid pressure explains this? (1 mark)

A school in Eldoret has an overhead tank placed 8 metres above the ground. When a tap connected to the tank is opened at ground level, water gushes out quickly as shown in the image below. Which principle of liquid pressure explains this? (1 mark)

A school in Eldoret has an overhead tank placed 8 metres above the ground. When a tap connected to the tank is opened at ground level, water jets out quickly as shown in the image below. Which principle of liquid pressure explains this? (1 mark)

A lady carries a basket of mangoes weighing 180 N on her head. The base of the basket has an area of 0.045 m². Calculate the pressure on her head.  (2marks)

A lady carries a basket of mangoes weighing 180 N on her head. The base of the basket has an area of 0.045 m². Calculate the pressure on her head.  (2marks)

A lady carries a basket of mangoes weighing 180 N on her head. The base of the basket has an area of 0.045 m². Calculate the pressure on her head.  (2 marks)

A steel filing cabinet weighing 600 N stands on four small wheels. Each wheel has a contact area of 0.0005 m². Calculate the pressure on the floor and discuss whether placing the cabinet on a wooden floor could cause damage.  (3marks)

A steel filing cabinet weighing 600 N stands on four small wheels. Each wheel has a contact area of 0.0005 m². Calculate the pressure on the floor and discuss whether placing the cabinet on a wooden floor could cause damage.  (3marks)

A steel filing cabinet weighing 600 N stands on four small wheels. Each wheel has a contact area of 0.0005 m². Calculate the pressure on the floor and discuss whether placing the cabinet on a wooden floor could cause damage.  (3 marks)

A shopkeeper wants to design a cooking oil dispenser that pours oil faster without shaking the container. Using the principle of liquid pressure, suggest one modification to the design and explain why it would work. (2 marks)

A villager is carrying a bucket of water on her head using no support. Suggest a way to make it more comfortable.  (1mark)

A villager is carrying a bucket of water on her head using no support. Suggest a way to make it more comfortable.  (1mark)

A villager is carrying a bucket of water on her head using no support. Suggest a way to make it more comfortable.  (1 mark)