Pressure practice exercise 1

Refer to the diagram of a hydraulic car lift below. Explain how the mechanic is able to lift a heavy car by applying a small force on the pump handle. (2 marks)

Refer to the diagram of a hydraulic car lift below. Explain how the mechanic is able to lift a heavy car by applying a small force on the pump handle. (2 marks)

A car has a total weight of 12,000 N. The area of contact of each tyre with the road is 0.04 m². Calculate the pressure exerted on the road by the four tyres.  (2marks)

A car has a total weight of 12,000 N. The area of contact of each tyre with the road is 0.04 m². Calculate the pressure exerted on the road by the four tyres.  (2marks)

A car has a total weight of 12,000 N. The area of contact of each tyre with the road is 0.04 m². Calculate the pressure exerted on the road by the four tyres.  (2 marks)

A heavy object weighing 5,000 N is placed at the center of the plank, making it rest on the rollers as shown below. The contact area of each roller with the plank is 0.004 m². Calculate the pressure exerted by the plank on each roller.  (2marks)

A heavy object weighing 5,000 N is placed at the center of the plank, making it rest on the rollers as shown below. The contact area of each roller with the plank is 0.004 m². Calculate the pressure exerted by the plank on each roller.  (2marks)

A heavy object weighing 5,000 N is placed at the center of the plank, making it rest on the rollers as shown below. The contact area of each roller with the plank is 0.004 m². Calculate the pressure exerted by the plank on each roller.  (2 marks)

 A tractor weighing 40,000 N has four tyres, each with a contact area of 0.5 m² when inflated. If the tyres are slightly deflated, the contact area increases to 0.75 m² each. Calculate the difference in pressure exerted on the ground before and after deflation and explain the advantage of deflation when driving on soft ground.  (4marks)

 A tractor weighing 40,000 N has four tyres, each with a contact area of 0.5 m² when inflated. If the tyres are slightly deflated, the contact area increases to 0.75 m² each. Calculate the difference in pressure exerted on the ground before and after deflation and explain the advantage of deflation when driving on soft ground.  (4marks)

A tractor weighing 40,000 N has four tyres, each with a contact area of 0.5 m² when inflated. If the tyres are slightly deflated, the contact area increases to 0.75 m² each. Calculate the difference in pressure exerted on the ground before and after deflation and explain the advantage of deflation when driving on soft ground.  (4 marks)

A woman is walking across a soft lawn in high heels and keeps sinking. What can she do to prevent sinking?  (1mark)

A woman is walking across a soft lawn in high heels and keeps sinking. What can she do to prevent sinking?  (1mark)

A woman is walking across a soft lawn in high heels and keeps sinking. What can she do to prevent sinking?  (1 mark)

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)

A water tanker is delivering water to a school. The hose from the tanker is connected to an elevated storage tank 2 metres above ground. The flow is slow. Suggest two practical ways to increase water flow using the principle of liquid pressure. (2 marks)

A hydraulic lift has two pistons. The smaller piston has an area of 0.02 m² and the larger piston has an area of 0.5 m². If a force of 200 N is applied to the small piston, what is the force exerted by the large piston?

A hydraulic lift has two pistons. The smaller piston has an area of 0.02 m² and the larger piston has an area of 0.5 m². If a force of 200 N is applied to the small piston, what is the force exerted by the large piston? (1 mark)

A hydraulic lift has two pistons. The smaller piston has an area of 0.02 m² and the larger piston has an area of 0.5 m². If a force of 200 N is applied to the small piston, what is the force exerted by the large piston? (1 mark)

A gas delivery company in Nairobi transports heavy gas cylinders. They notice that the metal stands on the truck bed leave deep dents. What should they do to prevent this?

A gas delivery company in Nairobi transports heavy gas cylinders. They notice that the metal stands on the truck bed leave deep dents. What should they do to prevent this?  (1mark)

A gas delivery company in Nairobi transports heavy gas cylinders. They notice that the metal stands on the truck bed leave deep dents. What should they do to prevent this?  (1mark)

A gas delivery company in Nairobi transports heavy gas cylinders. They notice that the metal stands on the truck bed leave deep dents. What should they do to prevent this?  (1 mark)

An oil drum is filled to a height of 1.5 m with oil of density 800 kg/m³. Find the pressure at the bottom. g = 10 N/kg.

An oil drum is filled to a height of 1.5 m with oil of density 800 kg/m³. Find the pressure at the bottom. g = 10 N/kg. (1 mark)

An oil drum is filled to a height of 1.5 m with oil of density 800 kg/m³. Find the pressure at the bottom. g = 10 N/kg. (1 mark)

A farmer in Eldoret uses an irrigation system with pipes leading downhill from a raised tank. Why does water flow faster at outlets further downhill?

A farmer in Eldoret uses an irrigation system with pipes leading downhill from a raised tank. Why does water flow faster at outlets further downhill? (1 mark)

A farmer in Eldoret uses an irrigation system with pipes leading downhill from a raised tank. Why does water flow faster at outlets further downhill? (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)

In a wet season, a farmer in Eldoret uses a tractor with large rear tyres instead of narrow ones. Why is this important?

In a wet season, a farmer in Eldoret uses a tractor with large rear tyres instead of narrow ones. Why is this important?  (1mark)

In a wet season, a farmer in Eldoret uses a tractor with large rear tyres instead of narrow ones. Why is this important?  (1mark)

In a wet season, a farmer in Eldoret uses a tractor with large rear tyres instead of narrow ones. Why is this important?  (1mark)

In a wet season, a farmer in Eldoret uses a tractor with large rear tyres instead of narrow ones. Why is this important?  (1 mark)

A driver finds it harder to stop the car when the brake fluid level is low. What is the most likely reason?

A driver finds it harder to stop the car when the brake fluid level is low. What is the most likely reason? (1 mark)

A driver finds it harder to stop the car when the brake fluid level is low. What is the most likely reason? (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)