I bet that is actually true. But where in the world did you get this idea of?
Answer:
The magnitude of the resultant decreases from A+B to A-B
Explanation:
The magnitude of the resultant of two vectors is given by
where
A is the magnitude of the first vector
B is the magnitude of the second vector
is the angle between the directions of the two vectors
In the formula, A and B are constant, so the behaviour depends only on the function . The value of are:
- 1 (maximum) when the angle is 0, so the magnitude of the resultant in this case is
- then it decreases, until it becomes 0 when the angle is 90 degrees, where the magnitude of the resultant is
- then it becomes negative, and continues to decrease, until it reaches a value of -1 when the angle is 180 degrees, and the magnitude of the resultant is
The coefficient of restitution is a measure of the interaction of the ball with the material of the ground. Since the ground is too solid to move (usually), or give way, the energy of the ball-ground system must be conserved in the main. Some of the energy is released as sound waves but the rest is given to, or reflected back to the ball and it follows the path of reflection. When the ball is dropped vertically it returns along the same path. So the force is actually the potential energy created by dropping converted to kinetic energy on collision with the ground. This is the origin of the force making it bounce.
... AND A UNIT .
If I tell you that I have a piece of string that's 71 long, you still have no idea what I'm talking about until I tell you if that's millimeters, centimeters, inches, meters, feet, yards, smoots, kilometers, leagues, miles, furlongs, nanometers, Mach-seconds, chains, parsecs, light years etc.
<span>S= 1/2(V f + V I )t solve for V f
2s/t=Vf+Vi
</span><span>2s/t-Vi=Vf</span>