Chapter 11 Science- Motion

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the change in position of one object in relation to the position of some fixed object/


a measure of the total length along a path between two points.


a measure of both length and the direction of an object’s path from its starting point straight to its ending point.


the rate at which an object changes position.

Speed differ from Velocity

Speed: the ratio of the distance an object moves to the amount of time the object moves Velocity: the speed and direction an object is moving, measured to a reference point


the rate of change in velocity.

Two Examples of Acceleration

Free falling, and a rocket launch

Reference Point

To identify an objects position, you must compare its location with that of another object or place. That other object or object is called..

Straight lines

Distance between reference points and other locations can be measured in …

It Has Experienced Motion

When an object changes position over time, speed describes how quickly an object changes position.



Distance-time graph

A convenient way to show the motion of an object is by using a graph that plots the distance the object has traveled against time. This is called a…

A change in Velocity

a change in either speed or direction results in… Because velocity includes direction, it is possible for two objects to have the same speed but different velocities.

What velocities include

Speed and direction. To determine ________ of an object, you need to know both its speed and its direction.

How acceleration is measured

How quickly the velocity is changing. If velocity does not change there is no _____________.


Final Velocities-Initial Velocity/Time

Speed up or slow down

The direction of the acceleration determines whether an object will….


Negative acceleration is called ________. This means the object is slowing down.

How Velocity-time graphs and distance-time graphs are related

Both graphs are related because the distance an object travels depends on its velocity.


Initial Velocity-Final Velocity/Time


Distance/Time in a given direction


The speed and direction an object is moving, measure relative to a reference point

Velocities in the same direction

two objects moving the same direction

velocities in opposite directions

two objects moving opposite directions

Relative Motion

movement in relation to a frame of reference


a quantity that has a direction associated with it

Resultant Vector

the vector sum of two or more vectors

Instantaneous Speed

the rate at which an object is moving at a giving moment in time

Average Speed

the total distance traveled divided by the time it takes to travel that distance

Constant Acceleration

a steady change in velocity

Linear Graph

a graph in which the displayed data from a straight line

Nonlinear Graph

a graph in which the displayed data from a curved line

Three Changes in acceleration

change in speed, direction, and both

The upright slope of a speed-time graph

the point on the graph that represents acceleration

The downward slope of speed-time graph

the point on the graph that represents deceleration

No movement

A straight line on the graph represents..

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