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Presence of friction, incline and so on.

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Q: What causes speed to increase or decrease?
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Does the core cause a huge increase in the speed of P-waves?

No, it causes a huge decrease in speed.


What causes skateboard speed to increase or decrease?

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What occurs when a force causes the speed of an object to decrease?

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What causes voltage to increase and decrease?

If you are referring to the voltage at your residence, then voltage variation is caused by the changes to the load on your supply network. The network load varies throughout the day, being busiest, for example, around lunchtime and around dinnertime. The resulting load current variation causes the supply voltage to vary (it drops when the load current increases) but, by law, your supplier is obliged to maintain any voltage variation within limits -in the UK, for example, these limits are between +10% and -6% of the nominal 230 V.


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Can acceleration change with out increase or decrease speed?

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How does the speed of atoms in a substance related to its temperature?

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What causes heart rates to increase and decrease?

fudge