Acceleration and force
Our law of inertia was:
A body that is subject to no external forces will not accelerate.
So, does that mean that if you push or pull ("exert a force") on something it *will* accelerate? What's the relationship of force and acceleration?
Acceleration
Acceleration = change in velocity (either speed or direction) over time.
In the following examples,
- Say whether there is acceleration or not,
- Identify the force, or explain why there's no force...
Acceleration?
See: HHSTT rocket sled video.Acceleration?
Orbit of the Hubble Space Telescope around the earth.
Acceleration?
See: Crash test video.Acceleration?
A car...
- Moving along a straight, level road at 120 km/hr?
- Moving along a straight, level road and slowing from 120 km/hr to 70 km/hr?
- Rounding a curve at a steady 50 km/hr?
- Moving uphill along a straight incline at 50 km/hr?
- Rounding a hill top at 50 km/hr?
Acceleration!
These things all mean "Acceleration" in Physics-speak:
- speeding up
- slowing down
- turning
What 3 acceleration devices can a car driver control?
if (! $homepage){ $stylesheet="/~paulmr/class/comments.css"; if (file_exists("/home/httpd/html/cment/comments.h")){ include "/home/httpd/html/cment/comments.h"; } } ?>