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Inside Collection (Course): Natural Sciences Grade 7
Assignment 4:
1. No
2. No
Mass as opposed to weight: Mass gives an indication of the amount of matter, while weight indicates how strongly the earth attracts an object. Mass remains unchanged, while weight is influenced by the location on earth - e.g. high up in the atmosphere it is less.
Assignment 4
Matter occupies space
Study the following sketches and answer the questions that follow:
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1. Is it possible for two objects to occupy the same space simultaneously? (Yes / No)
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2. Examine the sketch of a fish in an aquarium:
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When we examine the above sketches, it is obvious that two objects cannot occupy the same space at the same time. The reason for this is quite simple: Each object requires its own space. Another deduction that we could make is that matter that is displaced by some other substance occupies other available space.
Matter has volume and mass
If you drink all the cold drink in a cold drink can, the can is not left empty. The original contents (cold drink) have been replaced with air! The same space is therefore occupied by another form of matter! Sometimes we speak of the contents of the tin, meaning the matter inside the tin. The space inside the tin that is occupied by matter (cold drink or air, in this instance) is referred to as volume. To some extent, therefore, volume and content are synonymous.
Plan an experiment to prove that air occupies space.
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Mass is defined as:
"a physical quantity expressing the amount of matter in a body"and is measured in kilogram.
If I therefore say that I weigh 55 kg, I mean that the amount of matter comprising my body comes to 55 kg.
The mass of an object therefore gives an indication of the amount of matter that an object contains.
The definition of weight is:
" the vertical force experienced by a mass as the result of gravitation."
It is important to know that all forms of matter (solid substances, liquids and gases) have mass.
Explain the difference between mass and weight in your own words.
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Learning Outcome 1: The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.
Assessment Standard 1.1: We know this when the learner plans investigations: plans simple tests and comparisons and considers how to conduct these properly
Learning Outcome 2: The learner will know and be able to interpret and apply scientific, technological and environmental knowledge.
Assessment Standard 2.3: We know this when the learner interprets information by identifying key ideas in text, finding patterns in recorded data, and making inferences from information in various forms (e.g. pictures, diagrams, text).
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Last edited by Siyavula Uploaders on Mar 16, 2009 5:15 am -0500.