Physics Chapter 3

acceleration

Acceleration is the rate of change in an object's velocity.

uniform motion

An object in uniform motion moves along a straight line with an unchanging velocity.

What happens when the velocity vector and the acceleration vector of an object in motion are in the same direction?

The speed of the object increases.

displacement

a change in position having both magnitude and direction: it is equal to the final position minus the initial position.

vector

a quantity that has magnitude and direction.

a change in velocity results in

acceleration

average acceleration

change in velocity during some measurable time interval divided by that time interval.

velocity changes when the direction of motion

changes

all objects in free fall

have the same acceleration

free fall

is the motion of an object when gravity is the only significant force acting on it. Action is due to gravity alone. Air resistance has little affect

unit for acceleration

m/s2

accelerate

speed up, slow down, change position

origin

the point at which both variables in a coordinate system have the value.

velocity

time rate of change in position

acceleration

time rate of change of the velocity

noniniform velocity

velocity is changing

constant acceleration

velocity of an object changes at a constant rate

An object moving with constant velocity has

zero acceleration