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Phythagreum Theorem
c²=a² + b²
*c= hypotenuse
Vector Components (+ SOH CAH TOA)
*vector components can be negative also since here negative means a direction
choose the sign of a vector component based on its…
direction!
true or false: mass and weight are the same thing?
false!
-weight is a force
true or false: coefficients of friction (u) have no units
true!
0 <= u <= 1; 0 is less friction and 1 is more friction
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”
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!
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