Kinematics in Two Dimensions; Vectors
Vector:�
A quantity that has magnitude, size, and direction. Velocity and
displacement are examples.
Scalar:�
A quantity that has only magnitude, or size.� Speed, distance, and
time are examples.
Vector Addition:
When vectors are graphically added, they are drawn head to tail.�
This may also be described as placing the arrowhead of one vector
next to the tail end of another vector.
Resultant:
- The result of adding two or more vectors; vector sum.� It
is drawn from the tail of the first vector to the tip of the
last vector.
Phythagorean Theorem:
Vector Component:
- The parts into which a vector can be separated and that act
in different directions from the vector.
Horizontal Motion of a Projectile:
Since gravity acts only vertically, there is 0 acceleration.
Horizontally, the projectile moves with a constant speed.
We can use one of the previous kinematic formulas� v=d/t
Vertical Motion of a Projectile:
Use previous kinematic formulas in the vertical direction.
a = Δv/Δt=(vf-vi)/t
d=vit+at2/2
vf2=vi2+2ad
acceleration due to gravity = -9.8 m/s2
|
