# Unit 2

## Vocabulary Words

Component-a part or element of a larger whole

Horizontal -parallel to the plane of the horizon; at right angles to the vertical.

Parabola -Motion of Projectiles.

Projectile -A projectile is any object that once projected or dropped stays in motion.

Range -the max distance that a charged particle as a proton can penetrate.

Resultant -the vector sum of two or more vectors.

Trajectory -The line or curve described by an object moving through space.

Vertical –having an alignment, such that the top is directly above the bottom.

Vector -a quantity having direction as well as magnitude.

## Formulas

Δ – delta (change in or difference)

Δx = (1/2) (v1+v0) t x – position (meters)

v – velocity (meters per second)

Δx = v0t + (1/2) a t2 t – time (seconds)

v12 = v02 + 2 a (Δx ) a – acceleration

ag – acceleraton due to gravity

v1 = v0 + a t 9.8 m/s2 at Earth’s surface

SOHCAHTOA sine / cosine / tangent - applied to right triangles

1. Vertical and horizontal velocities do NOT affect each other
2. Scalar is a measuring quantity, a magnitude of some-sort. ex: size, distance, speed
3. Vector is a magnitude and direction. ex: velocity, displacement

θ – “theta” = angle

sin θ = opp

hyp

hyp

tan θ = opp

## Big Ideas of Unit

Describe the ideal conditions for projectile motion

Predict how air resistance will affect a projectile

Explain how the components of motion act independently

Diagram and calculate the horizontal and vertical components of a projectile

Diagram and calculate initial and final velocity of a projectile

Diagram and calculate the range and maximum height of a projectile