2-D Kinematics

Vectors

100

We decompose vectors into x and y - _____________

components

200

If, at a particular time, you have v_x and v_y, what math method would you use to solve for v?

Pythagoras

300

What is the term used to describe how we add vectors by drawing them with the second vector arrow starting where the first one ends?

Tip-to-tail

Launched Horizontally

100

What is v_y(initial) for a ball that is launched horizontally at 5 m/s off a 10 m high cliff?

0 m/s

200

How far will a projectile travel in the horizontal direction if launched horizontally at 3.5 m/s and is in the air for 4 seconds?

14 m

300

A car drives off a 15 m high cliff at a speed of 10 m/s. How long is it in the air? 

1.7 s

Equations and Variables

100

Provide any equation rearranged for time

t = d/v

200

Write the quadratic formula

x = (-b+-sqrt(b²-4ac))/(2a)

300

Which equation is derived from adding the areas of a triangle above a rectangle on a velocity-time graph?

d = ((v_i + v_f)/2)t

Launched at an Angle

100

Which initial velocity component is larger if a projectile is launched at an angle of 50^o above the horizontal? 

y-component

200

A ball is thrown from the ground at 15 m/s at an angle of 20^o above the horizontal. What will its velocity be when it hits the ground?

15 m/s at an angle of 20^o below the horizontal.

300

A ball is thrown 20 m/s at an angle of 60^o above the horizontal. How far does it travel in the horizontal direction if it's in the air for 18 seconds?

180 m