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Questions and Answers
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.
phenomena
Pressure on a surface is described by the equation: ______ = force / area.
Pressure
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 ______.
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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.
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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.
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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.
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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.
