# 2D Motion & Vectors

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 Author: Gymnastxoxo17 ID: 275294 Filename: 2D Motion & Vectors Updated: 2014-05-25 11:31:48 Tags: Chapter Three Folders: H Physics Description: d Show Answers:

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1. resultant
• a vector representing the sum of two or more vectors
• drawn from the tail of the first to the head of the last, sum of the vectors
2. Pythagorean theorem
a2+b2=c2
3. tanθ
4. sinθ
opp/hyp
5. cosθ
6. projectile motion
• free fall with an initial horizontal velocity
• neglecting air resistance, a projectile has a constant horizontal velocity and a constant downward free fall acceleration, and follows a parabolic path
• two objects fall at the same rate and will hit the ground at the same times when released together, even if one is thrown at an angle with initial horizontal velocity
7. properties of vectors
• can be moved parallel to themselves through planes
• can be multiplied/divided by scalars
• can be added in any order, can be subtracted by adding opposite directions
8. zero vector
vectors with 0 magnitude with no assigned direction
9. 45-45-90 triangle
• hyp=x
• sides=x
10. 30-60-90 triangle
• smallest side=x
• middle side=x
• hyp=2x
11. trajectory
parabolic path that an object in projectile motion follows
12. acceleration neglecting air resistance
no horizontal acceleration

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