Podcast
Questions and Answers
A phenomenon is an event that can be observed by the ______.
A phenomenon is an event that can be observed by the ______.
senses
Scientists study ______ to find out about them - what causes them and what they can do.
Scientists study ______ to find out about them - what causes them and what they can do.
phenomena
Pressure on a surface is described by the equation: ______ = force / area.
Pressure on a surface is described by the equation: ______ = force / area.
Pressure
The SI unit for pressure is ______ (newtons per square metre).
The SI unit for pressure is ______ (newtons per square metre).
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An object resting on a surface exerts pressure on the surface because of the object's ______.
An object resting on a surface exerts pressure on the surface because of the object's ______.
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Weight is the force produced by ______ acting on a solid, a liquid or a gas, pulling the material downwards towards the center of the Earth.
Weight is the force produced by ______ acting on a solid, a liquid or a gas, pulling the material downwards towards the center of the Earth.
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The ______ that the cube exerts on the ground is found by using the equation above.
The ______ that the cube exerts on the ground is found by using the equation above.
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An object exerts a ______ on the ground according to the area of its surface that is in contact with the ground.
An object exerts a ______ on the ground according to the area of its surface that is in contact with the ground.
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Your ______ acting downwards causes you to exert a force on the ground through the soles of your shoes.
Your ______ acting downwards causes you to exert a force on the ground through the soles of your shoes.
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These areas together are larger than the areas of the soles of your shoes and you therefore push on the ground with less ______ when lying down than when you are standing up.
These areas together are larger than the areas of the soles of your shoes and you therefore push on the ground with less ______ when lying down than when you are standing up.
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Study Notes
Phenomena and Scientific Study
- A phenomenon is an event that can be observed by the senses, such as a rainbow.
- Scientists study phenomena to find out about them, including what causes them and what they can do.
Pressure
- Pressure is the effect of a force exerted over an area.
- Pressure can be defined by the equation: Pressure = force / area.
- The SI unit for pressure is N/m² (newtons per square meter), but it can also be measured in N/cm² (newtons per square centimeter).
- An object resting on a surface exerts pressure on the surface due to its weight.
- Weight is the force produced by gravity acting on a solid, liquid, or gas, pulling the material downwards towards the center of the Earth.
- The pressure an object exerts on the ground is found by using the equation: pressure = force / area.
Examples of Pressure
- If a cube has a weight of 500 N and the area of its side is 1 m², the pressure it exerts on the ground is 500 N/m².
- If the cube has a weight of 500 N and the area of its side is 2 m², the pressure it exerts on the ground is 250 N/m².
- A block with dimensions 1m x 1m x 2m and a weight of 200 N exerts a pressure of 200 N/m² when stood on one end, but a pressure of 100 N/m² when laid on its side.
- A person's weight acting downwards causes them to exert a force on the ground through the soles of their shoes, and they exert less pressure when lying down than when standing up.
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Description
This quiz explores the concept of phenomena in science, including the study of observable events and the application of previous knowledge to explain them.
