22 terms

Speed

is a measure of the distance an object travels per unit of time

Unit of speed

are units od distance divided by units of time.

The SI unit for speed

is the meters per second

Constant speed

is the rate of change of position in which the same distance is traveled each second.

Instantaneous speed

is speed at specific instant in time

Average speed

is the total distance traveled divided by the total time it took to go that distance.

The equitation for average speed is

v=d/t, where the symbol v stands for average speed, d stands for total distance, and t stands for total time.

distance-time graphs

Graphs that compare distance and time are called ....

Constant speed is shown as

a straight line on a distance- time graph

Distance-time graphs

can be used to compare the motion of two different objects

motion

Distance-time graphs can be used to compare the ....... of two different objects

Steeper lines

on distance-time graphs indicate faster speeds.

Faster speeds is shown as

a steeper lines on distance-time graphs

The average speed

Distance-time graphs can be used to calculate ........

The average speed of an object

Distance-time graphs can be used to calculate ........... .The difference in distance between two points is divided by the difference in time between same points.

decreasing

When the slope of a line on a distance-time graph decreases, it means that the speed of the objects is ................

An horizontal line

on a distance- time graph indicates that the motion has stopped.

increasing

When the slope of a line on a distance-time graph increases, it means that the speed of the object is...........

Constant

Even when the speed of an object isn't ..........., its average speed can be calculated from a distance-time graph.

Velocity

is the speed and the direction of a moving object.

changes

Velocity...........when the speed of an object changes, when the direction in which the object is moving changed, or when the speed and the direction change.

The velocity of an object

can be represented by an arrow. The length of the arrow indicates the speed. The arrow points in the direction of the object's motion.