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Questions and Answers
Pressure is calculated by dividing the force applied by the:
Pressure is calculated by dividing the force applied by the:
The greater the force applied over a given area, the smaller the pressure.
The greater the force applied over a given area, the smaller the pressure.
False (B)
Pressure is measured in units called ______.
Pressure is measured in units called ______.
Pascals
Explain the relationship between pressure and area.
Explain the relationship between pressure and area.
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Match the following quantities with their respective units of measurement:
Match the following quantities with their respective units of measurement:
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A student wants to calculate the pressure they exert on the floor. Which of the following pieces of equipment would they need to measure their weight?
A student wants to calculate the pressure they exert on the floor. Which of the following pieces of equipment would they need to measure their weight?
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Describe a method to measure the area of the floor in contact with a person's foot.
Describe a method to measure the area of the floor in contact with a person's foot.
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The equation for calculating pressure is ______.
The equation for calculating pressure is ______.
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Pressure is defined as the amount of _________ acting per unit area.
Pressure is defined as the amount of _________ acting per unit area.
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What is the standard unit of measurement for pressure in physics?
What is the standard unit of measurement for pressure in physics?
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Increasing the force applied to a surface will decrease the pressure.
Increasing the force applied to a surface will decrease the pressure.
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What is the formula for calculating pressure?
What is the formula for calculating pressure?
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The pressure exerted on a surface is ______ proportional to the force applied.
The pressure exerted on a surface is ______ proportional to the force applied.
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Match the following units of pressure measurement with their corresponding descriptions:
Match the following units of pressure measurement with their corresponding descriptions:
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If you apply a force of 50 N to a surface with an area of 10 m², what is the pressure exerted?
If you apply a force of 50 N to a surface with an area of 10 m², what is the pressure exerted?
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Explain how the area of a surface affects the pressure exerted on it.
Explain how the area of a surface affects the pressure exerted on it.
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A girl weighing 400 N standing on one stiletto heel exerts pressure on the ground.
A girl weighing 400 N standing on one stiletto heel exerts pressure on the ground.
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If a dog weighs 300 N and has four legs each with an area of 5 cm², what is the total area of the dog's legs?
If a dog weighs 300 N and has four legs each with an area of 5 cm², what is the total area of the dog's legs?
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Pressure is the amount of ______ pushing on a certain ______.
Pressure is the amount of ______ pushing on a certain ______.
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What is the pressure exerted by a girl weighing 400 N standing on one ‘stiletto’ heel with an area of 1 cm²?
What is the pressure exerted by a girl weighing 400 N standing on one ‘stiletto’ heel with an area of 1 cm²?
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The pressure a box exerts on a table depends only on its weight.
The pressure a box exerts on a table depends only on its weight.
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What is the formula used to calculate pressure?
What is the formula used to calculate pressure?
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Pressure is the amount of ______ acting per unit area.
Pressure is the amount of ______ acting per unit area.
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If a dog weighing 300 N has four legs, each with an area of 5 cm², what is the pressure exerted by one leg?
If a dog weighing 300 N has four legs, each with an area of 5 cm², what is the pressure exerted by one leg?
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How do you calculate the pressure exerted by a stone statue weighing 3,000 N with a base area of 0.6 m²?
How do you calculate the pressure exerted by a stone statue weighing 3,000 N with a base area of 0.6 m²?
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The pressure exerted by a submarine porthole at a depth of 100 m can be calculated using the formula that involves dividing the ______ by the area.
The pressure exerted by a submarine porthole at a depth of 100 m can be calculated using the formula that involves dividing the ______ by the area.
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Match the following weights to their respective pressure calculations:
Match the following weights to their respective pressure calculations:
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Flashcards
Pressure
Pressure
The force applied per unit area.
Mass vs Force
Mass vs Force
Pressure measures the force applied to an area, not mass.
Pressure Calculation
Pressure Calculation
Pressure is calculated using the force applied at an angle of 90° to an area.
Effect of Force on Pressure
Effect of Force on Pressure
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Effect of Area on Pressure
Effect of Area on Pressure
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Units of Force
Units of Force
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Units of Area
Units of Area
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Pressure Units
Pressure Units
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Density
Density
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Unit of Pressure
Unit of Pressure
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Force
Force
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Area
Area
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Calculating Pressure Formula
Calculating Pressure Formula
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Direct Relationship of Force and Pressure
Direct Relationship of Force and Pressure
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Common Pressure Units
Common Pressure Units
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Pressure formula
Pressure formula
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Calculating Pressure Example
Calculating Pressure Example
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Dog's Foot Pressure
Dog's Foot Pressure
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Submarine Pressure
Submarine Pressure
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Study Notes
Grade 8 Science Study Notes
- This document is intended for Grade 8 students.
- The topics covered are pressure, density, liquid pressure, and adaptation.
- The content includes worksheets, study sheets, and examples.
Unit 7: Pressure and Density
- Mass: The amount of matter in an object. Measured in grams (g), kilograms (kg), or tons (t).
- Measuring mass: Use a balance scale.
- Volume: The amount of space a substance or object occupies. Measured in cubic centimeters (cm³) or cubic meters (m³).
- Measuring volume: For liquids, use graduated cylinders or burettes. For regular-shaped objects, multiply length × width × height. For irregular-shaped objects, use water displacement (Eureka Can).
- Density: Mass per unit volume (Density = Mass/Volume). Units are g/cm³ or kg/m³.
- Effect of mass and volume on density: Density is directly proportional to mass and inversely proportional to volume. Increasing mass increases density; increasing volume decreases density.
- Density of solids, liquids, and gases: Solids have high density due to close particles; liquids have lower density; gases have the lowest density.
- Pressure: Force per unit area (Pressure = Force/Area). Units are pascals (Pa) or N/m².
- Factors affecting liquid pressure: Pressure increases with depth and with density of the liquid.
- Calculating Pressure: Use the formula Pressure = Force/Area.
- Units: Other units of pressure include bar, atm, torr, mmHg, and psi.
- Illustrative Examples: Examples include the effect of force and area on pressure (e.g., tractors, drawing pins, knives).
Unit 8: Selection
- Adaptation: Features and characteristics that allow organisms to survive and reproduce in their environment. Adaptations can be structural, behavioral, or functional.
- Types of adaptation: structural (physical features), behavioral (how an organism acts), and functional (biological processes).
- Adaptation to cold regions: Animals in cold regions often have small surface areas, thick layers of fat or fur, small ears to prevent heat loss.
- Adaptation to desert regions: Some animals have specially adapted kidneys to conserve water (functional adaptation), while others are most active at cooler times of the day (behavioral adaptation).
- Role of Adaptation: Adaptations help organisms better interact with their environment, respond to changes over time, and maintain a competitive advantage in acquiring resources, reproduction, and protection.
- Natural Selection: Involves variations within a species, where individuals with advantageous characteristics are more likely to survive, reproduce, and pass those characteristics to their offspring. This results in changes in the characteristics of a population over time.
- Selective Breeding (Artificial Selection): Humans select and breed organisms with desirable traits to produce offspring with those traits, leading to changes in the population over generations.
- Species: Defined as similar organisms capable of interbreeding and producing fertile offspring, or as a group of similar organisms with similar DNA that occupies the same ecological niche.
- Ecological niche: The role or position of an organism within its particular ecosystem (includes type of food, habitat, reproduction, interactions with other species).
- Evolution: A change in the inherited characteristics of a population over time through natural selection and may result in new species.
- Variation: Variation in individual traits, whether genetic (due to differences in genes), behavioral, or structural, drives evolution, especially when environmental conditions change. Examples include different types of birds within the same species or difference in size or color.
- Virus structure: They have a protein coat (capsid) containing DNA or RNA that inject genes into a susceptible cell.
- Viral reproduction: Viruses reproduce inside a host cell, using the host's cell machinery to create new virus particles.
- Examples of adaptations in different animals:
- Owls' good hearing for finding prey at night
- Cacti's thick stems, reduced leaves, and extensive root systems to survive in hot, dry deserts
- Musk Ox’s thick fur to protect them from the cold.
- Camels’ humps to store water and wide feet to prevent sinking into soft sand.
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Description
Test your understanding of pressure as a concept in physics. This quiz covers the relationship between force, area, and pressure, unit measurements, and practical applications. Equip yourself with knowledge about calculating and measuring pressure effectively.
