Chapter 5: Projectile Motion Review

A set of 15 vocabulary flashcards reviewing key terms, formulas, and principles of projectile motion based on Chapter 5 notes.

Vector

A physical quantity that possesses both magnitude (size) and direction.

Parabolic Path

The curved trajectory followed by a thrown or launched object (neglecting air resistance).

Horizontal Acceleration

The acceleration component of a projectile parallel to the ground, which is equal to zero when neglecting air resistance.

Independence of Motion Components

The principle that vertical motion (up-and-down) and horizontal motion (side-to-side) act completely independently of each other.

Simultaneous Free-Fall and Horizontal Launch

The phenomenon where an object dropped straight down and an object launched horizontally from the same height reach the ground at the exact same time.

Velocity at the Vertex

The state at the apex of a projectile's path where vertical velocity is zero and total velocity is purely horizontal.

Horizontal Distance Calculation

The product of horizontal speed and time ($\text{Distance} = \text{Speed} \times \text{Time}$); for example, traveling at $20\,\text{m/s}$ for $3\,\text{s}$ covers $60\,\text{meters}$.

Complementary Launch Angles

Pairs of launch angles that sum to $90^\text{o}$ (such as $30^\text{o}$ and $60^\text{o}$) which achieve the same horizontal distance (range) when launched at equal speeds.

Resultant Vector Addition

The process of finding the combined magnitude of perpendicular vectors using the Pythagorean theorem ($a^2 + b^2 = c^2$), such as adding a $40\,\text{km/h}$ North vector to a $30\,\text{km/h}$ East vector to get $50\,\text{km/h}$.

Initial Vertical Velocity (Horizontal Launch)

The initial speed of an object along the vertical axis when released strictly horizontally, which is always equal to zero.

Minimum Speed Point

The specific position at the peak of a projectile trajectory where overall speed is lowest because vertical speed equals zero.

Projectile Range Factors

The two primary launch variables that dictate the total horizontal distance traveled: launch angle and initial launching speed.

Vertical Drop Distance Formula

The distance formula $\text{Distance} = 5 \times t^2$ used to determine free-fall distance; after $2\,\text{seconds}$, an object falls $20\,\text{meters}$ ($5 \times 2^2 = 20\,\text{m}$).

Maximum Vector Sum

The greatest possible magnitude resulting from adding two aligned vectors, calculated by adding their sizes together directly (e.g., $8 + 3 = 11$).

Vertical Velocity Behavior

The continuously changing speed component of a projectile that decreases as it ascends and increases as it descends due to constant gravitational acceleration.