Moving man

• What graphs of a person standing still would look like
• it would be a straight line.
• What graphs of a person moving away from an observer at a constant speed would look like.
• The lines would spike up and to the right.
• What graphs of a person moving towards an observer at a constant speed would look like.
• The lines would go downwards.
• How differences in speed appear on the graphs
• differences of speed appear as large spikes upward, or smaller ones.

What number and unit are written directly under the moving man? 

Number: 0 Unit: meters.

The distance from the Moving man to the

House: 8 meters

Tree: 10 meters

Wall: 8 meters

The displacement from the moving man:

House: 8 meters

Tree: 10 meters

Wall: 8 meters

What is the difference between an object’s SPEED and its VELOCITY?
Speed compares the distance, and the velocity compares the objects’ displacement.

A) The unit of distance in the moving man is 20________(yellow bar)

B) The unit of time used in the moving man is seconds_______ (blue sky)

At which two velocities did he move faster? 4 meters/second.

	SPEED	TIME	DISTANCE COVERED
TRIAL #1	1 meter/sec (slower)	2 seconds	2m
TRIAL #2	4 meter/sec (faster)	2 seconds	8m

TRIAL #1    ____2_____ meters divided by ___2_______sec = _____1________ m/sec

TRIAL#2    _____8____  meters divided by  ______2___sec = _______4_______m/sec

1) EXPLAIN the difference in motion represented by a straight line and a curving line on a  “distance vs. time” in terms of constant or changing speed.

A straight line means: there is no acceleration, the speed is constant. 

A curved line means: There is increasing acceleration. 

___________________________________________________________________________

2) Changing speed is called “acceleration” (speeding up) or deceleration (slowing down). Describe the shape of an acceleration line on a Distance vs. Time graph of acceleration.

Its going upwards.

___________________________________________________________________________

3) EXPLAIN the difference between the motion represented by a flat line and a sloping straight line in a “distance vs. time” graph.

A flat line has no acceleration. A sloping straight line 

___________________________________________________________________________

4) If the slope of a line on a  “distance vs. time” graph is steep. What is different about the motion then when it is not steep?

If the line is straight, the acceleration is constant, but when it is steep, the acceleration is increasing. 

5) Look at the graph below and answer the following questions.

A) CALCULATE the average speed/velocity between point B & Point C by finding the slope of the line between the 6th and 15th seconds (show work below)

It is - 1.25 m a second

B) Why is the line sloping upward to the right between the 2nd & 3rd second, but downward to the right between 6th and the 15th seconds? 

his speed is accelerating, and then decelerating. 

__It is because he was running fast but then he he leveled out his speedl__(or made it constant)_____________________________________________________________________

C) During what two times did he stop moving?

Time 1 ________he stopped between 3 and 6 _________________________ Time __________and 15 through 20_________________________