PhysicsCh3

What are the two ways that a vector can be described?
- Magnitude and angle
- Components (X and Y)
Adding vectors
- A+B = C
- Components: A_x+B_x = C_x , A_y+B_y = C_y
- Graphically: graphing from head to tail
- A-B = C
- Components: A_x-B_x = C_x , A_y-B_y = C_y Graphically: graphing from head to head
When adding vectors (componently), a vector with magnitude V making an angle θ with the x axis has what components?
Given the components, what is the vector's magnitude and direction?
- V_x = Vcosθ, V_y = Vsinθ
- V = √(V²_x+V²_y), tanθ = V_y/V_x
Projectile Motion - information without equations
- Break down into two motions (X and Y) which are completely independent of eachother.
- The Y motion has acceleration of -g
- The X motion has no acceleration!
Projectile Motion - equations based on components
- y = y₀+V_0yt-1/2gt
- V_y = V_0y-gt
- V_y²-V_y0² = -2gΔy
- x = x₀+V_0xt
- V_x = V_0x
How do an object dropped horizontally and thrown vertically compare? Why?

They will both land at the same time, because the ONLY acceleration acting on both is -g. It may start with V, but NOT ACCELERATE
What is relative velocity? How is it used practically?>
- Relative velocity is a reference to moving in/on something that is already in motion.
- Ex - walking 4m/s backwards on a train moving 8m/s forward
- Depending on which reference you are using the net velocity will be different!

Author

victimsofadown

203504

Card Set

PhysicsCh3

Description

PhysicsCh3

Updated

2013-02-26T10:30:36Z

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