Unit 1 - 1D Kinematics

International System of Units (SI Units)

kinematics

• simplest type - motion along a straight line

• characteristics of the object don’t matter, mass and shape do

• need to know - how the object moves, speed, direction, distance

scalers and vectors

• time is not a vector because it doesn’t occupy space

Velocity

• The rate at which an object changes its position

• find the average velocity between points on a graph by connecting points with a line and finding the slope

• something has a higher velocity when it covers more distance

• no difference between average and instantaneous velocity if the speed and velocity are constant

• velocity is negative when going to the left

• the area under the graph line is displacement

Acceleration

• a physical quantity that tells how fast you are gaining or losing speed, expressed in (m/s)/s or m/s²

• positive or negative acceleration doesn’t mean speeding up or slowing down

• speeding up - acceleration is in the same direction as the velocity

• slowing down - acceleration is in the opposite direction of the velocity

• if motion with constant acceleration is graphed, then it would be a straight line

Freefall

• the proccess of falling straight up and straight down

• the movement straight up is symmetrical to the movement straight down, so the entire time it takes to free fall is twice the time it takes to reach the maximum height