changes in speed
- when an object is stationary it has the same forces pushing down (gravity) and up (the surface the object is on)
- when an object is at a constant speed it has equal upward and downward forces but also equal forward and backward forces.
- when an object is accelerating, it has equal upward and downward forces and also forward and backward forces, the forward force is larger than the backward force
- when an object is decelerating it has equal upward and downward forces and also forward and backward forces, the backward force is larger than the forward force
changes in shape
- changes in shape due to force affect momentum, for example, crumple zones change shape due to the force they are hit, this decreases the force felt on passengers
changes in direction
- whichever direction the force is greatest in (resultant force), the object will travel in that direction. For example, if an object has a larger forward force than backward force, it will accelerate, likewise, if an object has a larger backward force than forward force, it will decelerate.
No comments:
Post a Comment