KinematicsThe study of motion of an object

without regard to the causes of the motion.

1. Linear (only along a straight line along a single axis).2. Forces not considered (other than to

acknowledge that the forces cause motion).3. The object in motion will be modeled as a

particle.

1-Dimensional MotionThe study of motion of an object along

only one axis of travel.

1. Horizontally – left to right, right to left2. Vertically – up to down, down to up

A B Motion – change in position of an object from one point to another pointFrame of reference – the object, or point, from which movement is determined or compared.May be the origin on a coordinate system (number line).

• An object’s position is its location with respect to a chosen reference point.The point may be the origin

of a coordinate system.• In the diagram, the

road sign is the reference point.

Notes: 1-Dimensional Horizontal Motion

Notes: 1-Dimensional Horizontal MotionScalar – a quantity that has magnitude (how much) ex. distance, time, mass, volume, speed Vector – a quantity that has magnitude and direction. (how much, which way) ex. displacement, velocity Direction can be represented in 3 various ways:

-20Newtons (down) +20 m/s (North)

→A - Represented as a line segment with an

arrow-tip.

Notes: 1-Dimensional Horizontal Motion

Direction can be represented in 3 various ways:

1. by sign: -20Newtons (down)2. by actual direction: +20 m/s (North)3. as a graphical line segment with an

arrow-tip.

Notes: 1-Dimensional Horizontal Motion

Distance – measure of sum total path traveled by an object.Distance is a scalar.

Displacement – change of position, in a certain direction, from an initial point to a final pointDisplacement is a vector. x = xf - xi

Notes: 1-Dimensional Horizontal Motion

Who has the greater displacement?

Who has the greater distance?

What is the displacement of the gecko?

Notes: 1-Dimensional Horizontal Motion

What is the displacement of the gecko?

Notes: 1-Dimensional Horizontal Motion