1. Speed
4th Grade science
S4P3b

2. What is speed? 
Speed is a measurement of how fast an object moves relative to a reference point. It does not have a direction and is considered a magnitude or scalar quantity. 

3. Speed can be figured by the formula:
Speed = Distance/Time 
or 
s = d/t

4. How to Measure Speed 
In the United States we mostly think of speed in miles per hour or mph. This is the way the speed of a car is typically measured. In science and physics the standard unit of measure for speed is generally meters per second or m/s. 

5. Speed Average Speed S = d / t T = d / s D = s x t
Comparison of time and distance
A scalar quantity [magnitude only]
Distance traveled per unit time
S = d / t
T = d / s
D = s x t

6. Speed Instantaneous Speed
Speed at any instant

7. Speed Constant Speed Speed that does not change
Instantaneous speed that does not change

8. What causes speed?
Speed is caused by a force.

9. Forces Pushes or pulls May cause acceleration [changes in motion]
May also cause changes in shape