9th grade physics summary

1. there are 2 kinds of measurements. they are vector and scalar measurement.
2. vector measurement is the measurements  which  involve the direction of an object.
3. scalar measurement is the measurement that omit the direction of an object.
4. the example of vector measurements are velocity or force.
5 the example of scalar
measurements are mass, length
etc
6. velocity is the description of speed and direction of moving objects.
7. speed is the description of object speed.
8. acceleration is the change of speed in particular time.
9. v=s/t (v= velocity)
               (s = distance)
              (t = time)
10. gravititional acceleration will always be the same on the 1 plane.
11. the acceleration of sun light in vacuum is the same everywhere
12. deceleration is the decrease of speed in a particular time.
13. there are 2 kinds of acceleration. they are uniform and non uniform acceleration.
14. constant speed means that the speed has no acceleration.
15. the speed of an.object is influenced by the surface of plane