Density And Pressure
Overview
A drawing pin and an elephant's foot can push with very different forces, yet the pin is the one that goes through the board. The difference is not the force at all, it is how much area that force is spread over.
In this lesson you will learn how to calculate density and pressure, why a sharp point concentrates a force so effectively, and why the pressure at a point inside a still liquid or gas pushes equally hard in every direction.
Objectives
- Know and use the relationship between pressure, force and area: p = F/A
- Understand how the pressure at a point in a gas or liquid at rest acts equally in all directions
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Density And Pressure. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The equation for pressure is: A) p = F x A B) p = F / A C) p = A / F D) p = F + A Answer: B
- The density of a material is calculated using: A) volume / mass B) mass x volume C) mass / volume D) mass + volume Answer: C
- A force of 200 N acts on an area of 0.50 m squared. The pressure is: A) 100 Pa B) 200 Pa C) 400 Pa D) 0.0025 Pa Answer: C
- The pressure at a point in a liquid at rest: A) Acts only downwards B) Acts only sideways C) Acts equally in all directions D) Acts only on the container base Answer: C
- A block of mass 500 g has a volume of 250 cm cubed. Its density is: A) 0.5 g/cm cubed B) 2 g/cm cubed C) 125 g/cm cubed D) 750 g/cm cubed Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
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