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# Roughneck Physics: Projectile Motion

Classnotes on Projectile Motion
by

## Desiree Hutchins-Boyett

on 13 November 2017

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#### Transcript of Roughneck Physics: Projectile Motion

Projectile Motion
Facts:
Equations:
Trajectory
objects that are thrown or launched into the air.
Vectors:
is important too
is important
The details:
Examples: balls, people, cars
Air resistance and gravity only forces acting on projectile
Horizontal and vertical components are independent of each other. They are used to describe the motion of the projectile
Neglecting air resistance: speed up equals speed down, time up=time down
The combination of an initial forward velocity and the downward
vertical force of gravity causes the ball to follow a curved path.
This curved path is called the trajectory
Projectile Motion takes place in 2-dimensions: horizontal and vertical
The horizontal component has a constant velocity
The vertical component has a constant acceleration
The curved path can be described as a parabola
Diagrams
Comparison of vertical and horizontal components
Horizontal component is constant
Vertical component changes
Notice the horizontal speed is constant, but vertical speed
is changing by examining the length of the arrows (vectors).
**Time is common to both
x dimension a = 0
y dimension a = -9.8
Video Examples
MIT: Hunter and Monkey
Bullet Drop vs. Fired
Vectors: have direction and magnitude
ex: velocity, acceleration, force
scalars: magnitude but no direction
ex: speed, volume, mass, time
symbol: arrow, length represents magnitude and direction
Vectors in same direction are added
Vectors opposite are subtracted
Ex: Airplane flying 100km/h with tailwind 20 km/h (add) = 120 km/h
airplane flying 100km/h into a headwind 20 km/h (subtract) = 80 km/h
Resultant: the result of combining two vectors, it is the diagonal
resultant
horizontal velocity
vertical velocity
When horizontal and vertical componens are at right angles to each other, USE
Pythagorean Theorem to find resultant
Vector analysis of horizontal and vertical components
Hollywood:
The villain in Despicable Me
Projectiles launched at angle
Include cosine (x) or sine (y) of the angle with the initial velocity
Full transcript