Year 7 Exam > Year 7 Notes > Difference between Force and Pressure
Difference between Force and Pressure - Year 7 PDF Download
Introduction
- A force can manifest as either a push or a pull. When applied to an object, a force has the ability to alter the object's speed, change its direction of movement, or even reshape it.
- Pressure represents the amount of force distributed over an area. It can be quantified using the formula: pressure = force ÷ area. Notably, a force acting over a smaller surface area will result in higher pressure.
Examples:
- Imagine pushing a swing in the playground. Your push imparts a force that sets the swing in motion, altering its speed and direction.
- Consider a balloon being inflated. The air inside exerts pressure on the walls of the balloon. If more air is blown in (increasing the force), the balloon expands as the pressure rises due to the force acting over a smaller area.
How do we measure pressure?
- Mass: Mass indicates the amount of matter present. It is affected by gravitational force, which is the Earth's pull on this mass. For every kilogram of mass, the Earth exerts a force of 10 Newtons (N).
- Force: Every object possesses mass measured in kilograms. To determine the force in Newtons on Earth, we simply multiply the mass by 10.
- Pressure Calculation: Pressure can be calculated by dividing force by area: pressure = force ÷ area.
- Pressure Distribution: When pressure is applied over a smaller area, the force exerted is greater. For instance, standing on one foot concentrates your weight over a smaller surface, doubling the pressure. This concept is evident when comparing the pressure from a stiletto heel to that of a regular shoe.
FAQs on Difference between Force and Pressure - Year 7
| 1. What is the difference between force and pressure? |  |
Ans. Force is a push or pull on an object, while pressure is the force applied over a specific area.
| 2. How do we measure pressure? | |
Ans. Pressure is typically measured using a device called a manometer or a pressure gauge.
| 3. Can force and pressure be the same thing? | |
Ans. No, force and pressure are different concepts. Force is the action that creates pressure when applied over an area.
| 4. What are some examples of force and pressure in everyday life? | |
Ans. Examples of force include pushing a door open or lifting a book, while examples of pressure include sitting on a chair or using a bike pump.
| 5. Why is it important to understand the difference between force and pressure? | |
Ans. Understanding the difference between force and pressure is crucial in various fields such as physics, engineering, and daily activities to ensure the proper application of force and pressure for desired outcomes.
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Sep 10, 2025
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