CHEMISTRY MIDDLE SCHOOL

2 ways friction is helpful and 2 ways it does not

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Answer 1
Answer:

Benefits of friction.

1. Walking. Friction between the soles of our  shoes and the ground enables us to walk. The sole of the shoe is held to the ground through friction. This is what is termed as "grip" of the shoe. The more grip a shoes offers, the better and faster we can walk.

2. Writing. Writing using a pen requires friction. It is impossible to hold a pen in the hand without friction because it would slip out. Also the graphite point of the pencil would not make a mark on the paper without friction.

Drawbacks of friction

1. Drag. An aircraft taking off experiences significant friction between it and the air resulting in drag, so much fuel has to be used to  create energy to overcome the wind resistance.

2. Surface hindrance. Friction makes moving something heavy from  one part of a room to another very difficult. Sliding a large box across the flour takes a lot of energy due to friction between the box and the floor.

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The softest mineral in the Mohs hardness scale is?

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the talc

have a goed day

Wegner's theory that the continents slowly moved over Earth's surface became known as _________ .

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Wegener's idea that the continents slowly moved over Earth's surface became known as CONTINENTAL DRIFT.

  • Alfred Wegener was a German geophysicist who proposed the continental drift hypothesis.

  • According to this hypothesis, the continents were once a single landmass called Pangaea, which incorporated almost all the landmasses on Earth.

  • Wegener proposed that Pangea separated (approx. 200 million years ago) in order to create continents.

  • Finally, the continents slowly moved to their current positions by a process he called continental drift.

In conclusion, Wegener's idea that the continents slowly moved over Earth's surface became known as CONTINENTAL DRIFT.

Learn more in:

brainly.com/question/1867605
wedners idea that the continents slowly moved over Earth's surface became known as continental drift. According to Wegener, the continents drifted together to form the supercontinent Pangaea (pan jee uh).Pangaea means “all lands.” According toWegener, Pangaea existed about 300 million years ago.

The _______ of a wave is a measure of the amount of energy it carries

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The word that best fits is frequency. The sentence is The frequency of a wave is a measure of the amount of energy it carries. There is a direct relationship between frequency and energy of a wave. The constant of proportionality is h, Planck's constant. So, Energy = h * frequency. So, the answer is frequency. Although you should know that wavelength is related to frequency and so it is also a measure of the amount of energy and it should also be other valid answer.

The word that best fits is frequency.  Thus,the sentence is,the frequency of a wave is a measure of the amount of energy it carries.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

There is a direct relationship between frequency and energy of a wave. The constant of proportionality is h, Planck's constant. So, Energy = h  frequency. So, the answer is frequency.

Learn more about electromagnetic radiation,here:

brainly.com/question/29646884

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What type of lava/magma is in Galeras volcano

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Galeras Volcano is located near Pasto, Colombia. It is a Complex volcano. In other words, it is a volcano with more than one feature. Galeras has a B-Type lava/magma

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101010100101111000001011110101001010100101001010101010Explanation:

A hollow tube that holds the eyepiece lens and or mirrors

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If it is part of a microscope, its the Body Tube

The addition of heat energy to a system always causes the temperature of that system to increase. True False

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the answer is true
true truetruetrue
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