PHY Motion Along A Straight Line

kinematics

describing motion through properties such as position, time, velocity, and acceleration

Dynamics

concerned with the causes of motion which involves force

scalar

quantity that is fully described by magnitude only (speed, distance, time)

Vector

quantity that has both magnitude and direction (displacement, velocity, acceleration, force and momentum)

displacement

objects overall change in position

• has both magnitude and direction

displacement formula

∆𝑥 = 𝑥𝑓 − 𝑥i

resultant displacement (total)

the result of adding 2 or more vectors

average velocity

the rate at which position changes at a given time

average velocity formula

𝑣 = ∆𝑥 ∆t

average acceleration

the rate at which velocity changes

average acceleration formula

𝑎 = ∆𝑣 /∆𝑡 = 𝑣𝑓−𝑣i / 𝑡𝑓−𝑡i

instantaneous velocity

how fast an object was moving along its path

derivatives

instantaneous rate of change of a function with respect to one of its variables