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Friction

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. Types of friction include dry, flued, lubricated, skin, and internal. Friction can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire. Kinetic energy is converted to thermal energy whenever motion with friction occurs, for example when a viscous fluid is stirred. Another important consequence of many types of friction can be wear, which may lead to performance degradation or damage to components. Friction is a non-conservative force – work done against friction is path dependent. In the presence of friction, some kinetic energy is always transformed to … more »

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 Become A Better Singer In Only 30 Days, With Easy Video Lessons!

In the dead of night
Just close your eyes
Yeah hold on tight
For sunrise
Wait for me
I'll help you breathe
Yeah you gotta know, oh

If you need me now, need me now
Yeah I'll come, I'll come
Yeah I'll come around, come around
Yeah I'll run, I'll run
If you need me now, need me now
I'll come, I'll come
Close your eyes, close your eyes
And I'll be by your side

Close your eyes, close your eyes
And I'll be by your side

By your side

Those summer nights,
Our hazy eyes
We got so high
Just you and I
It's been a long time
But it'll be alright
Yeah you gotta know

If you need me now, need me now
Yeah I'll come, I'll come
Yeah I'll come around, come around
Yeah I'll run, I'll run
If you need me now, need me now
I'll come, I'll come
Close your eyes, close your eyes
And I'll be by your side

I'll be by your side
I'll be by your side

Close your eyes, close your eyes
And I'll be by your side

 Watch: New Singing Lesson Videos Can Make Anyone A Great Singer