Pearson’s Edexcel IGCSE Physics Density and Pressure Specification focus questions and answers

Questions

What is the relationship between density, mass, and volume?


How can you investigate density using direct measurements of mass and volume?


What is the relationship between pressure, force, and area?


How does the pressure at a point in a gas or liquid at rest act?


What is the relationship for pressure difference?


How does the density, gravitational field strength and height affect the pressure difference?


Can you give an example of how to use the relationship between density, mass, and volume in a real-world situation?


How can we calculate the pressure exerted by a force on an area?


Why is pressure difference important to understand?


How can the relationship between pressure difference and density, gravitational field strength and height be applied in a scientific or engineering context?

Answers

The relationship between density, mass, and volume is that density is equal to mass divided by volume, represented by the equation: ρ = m/V.


To investigate density using direct measurements of mass and volume, you can measure the mass of an object using a scale and measure its volume by water displacement or by measuring its length, width and height and calculating the volume using the formula V = l x w x h.


The relationship between pressure, force, and area is that pressure is equal to force divided by area, represented by the equation: p = F/A.


The pressure at a point in a gas or liquid at rest acts equally in all directions.


The relationship for pressure difference is: p = h x ρ x g, where p is pressure difference, h is height, ρ is density and g is gravitational field strength.


The density, gravitational field strength, and height all affect the pressure difference, as they are all included in the pressure difference equation.


An example of using the relationship between density, mass, and volume in a real-world situation would be determining the density of a substance to determine whether it will float or sink in a liquid.


To calculate the pressure exerted by a force on an area, divide the force by the area.


Understanding pressure difference is important in various fields such as fluid mechanics, atmospheric science, oceanography, etc.


The relationship between pressure difference and density, gravitational field strength and height can be applied in scientific and engineering contexts, such as designing and analyzing fluid systems, designing of wind turbines, analyzing the atmospheric pressure, etc.

Specification focus questions on Energy resources and Electricity generation for Edexcel IGCSE Physics

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Energy resources and Electricity generation

  1. What is meant by renewable energy? 
  2. Write down some examples of renewable energy. 
  3. What is meant by non-renewable energy? 
  4. Give some examples of non-renewable energy. 
  5. Write down the energy transfers taking place in the following ways of generating electricity. 
  1. wind 
  2. water 
  3. geothermal resources 
  4. solar heating systems 
  5. solar cells 
  6. fossil fuels 
  7.  nuclear power 

Large-scale electricity production

  1. What are the advantages and disadvantages of nuclear fuel? 
  2. What are the advantages and disadvantages of fossil fuels (coal, oil and gas)? 

Specification focus Questions on Work and Power for Pearson Edexcel IGCSE

Work and Power

  1. Write down the equation to calculate work in terms of force and distance moved in the direction of the force. 
  2. What are the units for force, distance and work done? 
  3. What is work done equal to? 
  4. Write down the relationship between gravitational potential energy, mass, gravitational field strength and height. 
  5. What are the units of gravitational potential energy, mass, gravitational field strength and height? 
  6. Write down the equation to calculate the kinetic energy of a moving object. 
  7. Explain how the conservation of energy produces a link between gravitational potential energy, kinetic energy and work, 
  8. Complete the following equation: Work Done = 
  9. What are the units of work done, force and distance? 
  10. What is power in terms of energy and in terms of work done? 

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