Ch. 4

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8 Terms

1
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Phythagreum Theorem

c²=a² + b²

*c= hypotenuse

<p>c²=a² + b²</p><p>*c= hypotenuse</p>
2
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Vector Components (+ SOH CAH TOA)

*vector components can be negative also since here negative means a direction

<p>*vector components can be negative also since here negative means a direction</p>
3
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choose the sign of a vector component based on its…

direction!

4
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true or false: mass and weight are the same thing?

false!

-weight is a force

5
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true or false: coefficients of friction (u) have no units

true!

0 <= u <= 1; 0 is less friction and 1 is more friction

6
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Kinetic Friction vs. Maximum Static Friction

-Kinetic Friction: force parallel to contact surface

-Maximum Static Friction

*0 <= Fsf <= Fsfmax

*right before slide=max static friction; slide=overcome Fsf

*key words: “before starts to slide”

<p><strong>-Kinetic Friction: </strong>force parallel to contact surface</p><p><strong>-Maximum Static Friction</strong></p><p>*0 &lt;= Fsf &lt;= Fsfmax</p><p>*right before slide=max static friction; slide=overcome Fsf</p><p>*key words: “before starts to slide”</p>
7
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true or false: in general, the normal force only equals mg when there is an object on a horizontal surface and the only other vertical force on the object is gravity

true!

8
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projectile motion: things to know

change in x= Voxt

-always find Vox and Voy

ax=0; ay= -9.8 m/s²

-symetric, so time and acceleration same

-at max height, the y-velocity=zero