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# Gould ch 11

### Reveiw for chapter 11

To describe motion accurately and completely, there must be a what? frame of reference
What is a system of objects that are not moving with respect to one another? frame of reference
What is movement in relation to a frame of reference? relative motion
This is the length of a path between two points. distance
What is the SI unit for measuring distance? meter
What is the SI unit for measuring very large distances? kilometer
What is the SI unit for measuring very short distances centimeter
What is the direction from the starting point and the length of the a straight line from the starting point to the ending point displacement
What gives information both about how far away an object is from a given point and in what direction the object is from that point displacement
What is a quantity that has magnitude and direction? vector
What does magnitude mean in a vector? size, length, or amount
What is it when vector magnitudes and directions are added together? vector addition
You can add two displacements if they are what? same direction
You subtract two displacements if they are what? different direction
The vector sum of two or more vectors is called what? resultant vector
The resultant vector points directly from the starting point to where? ending point
What is the ration of the distance an object moves to the amount of time the object moves? speed
SI unit of speed is what? m/s
The total distance traveled divided by the time it takes to travel that distance is what? average speed
What is the rate at which an object is moving at a given moment in time? instantaneous speed
What type of graph is a good way to describe motion? distance-time
The name of the slope of a line on a distance-time graph shows what? speed
Together the speed and direction in which an object is moving is called what? velocity
A change in velocity can be the result of what change(s)? speed, direction, or both
The rate at which velocity changes is called what? acceleration
Acceleration can be described as changes in what? speed, direction or both
An example of acceleration due to change and accelerate downward at a rate of 9.8m/s is what? free fall
Name the term that is movement of an object toward Early solely because of gravity. free fall
Give an example of acceleration due to changes in speed and direction. roller coster
Give an example of acceleration due to direction when you speed is constant carousel
What is a steady change in velocity? constant acceleration
Given an example of constant acceleration that results in changes to an objects velocity but has constant direction that was discussed in class. aircraft takeoff
How can you calculate acceleration for straight -line motion? dividing velocity by the total time
Name a graph that displays data form straight-line parts. linear graph
Name an example discussed in class of a linear graph that shows an increase in time-speed. acceleration
A graph that a curve connects the data points is what? non-linear
How fast a velocity is changing at a specific instant is called what? instantaneous acceleration
What is equal to distance/ time? speed
What is equal to speed multiplied by time? distance
What is equal to distance/speed time
What is equal to change in velocity / time? acceleration
Created by: kathleengould