Forces and Acceleration
An object needs a force to start moving. Things don't just start moving on their own, there has to be a resultant force to get it started. If the resultant force on a stationary object is zero, the objct will remain stationary.
No resultant force means no change in velocity. If there is no resultant force on a moving object it will just cary on moving at the same velocity.
- When a train or a car or a bus or anything else that is moving at a constant velocity then the forces on it must all be balanced.
- Things DO NOT need a constant overall force to keep them moving
- To keep going at a steady soeedm there must be zero resultant force
A resultant force means acceleration. If there is a non-zero resultant force, then the object will accelerate in the direction of the force,
- A non-zero resultant force will always produce acceleration
- This "acceleration" can take five forms:
3) Speeding Up
4) Slowing Down