Both sides previous revision Previous revision Next revision | Previous revision |
183_notes:examples:netforce [2014/07/10 17:06] – [Solution] caballero | 183_notes:examples:netforce [2017/12/05 02:48] (current) – pwirving |
---|
====== Example: Calculating the net force ====== | ====== Example: Calculating the net force ====== |
| |
The fan cart in the video below is observed to experience a net force to the right. Determine the (vector) net force acting on the fan cart. | The fan cart is observed to experience a net force to the right. |
| |
| Determine the (vector) net force acting on the fan cart. |
==== Setup ==== | ==== Setup ==== |
| |
So, we can now compute the net force, | So, we can now compute the net force, |
| |
$$\vec{F}_{net} = \sum \vec{F}_i = \vec{F}_fan + \vec{F}_{Earth} + \vec{F}_{track} = \langle 0.45, 0, 0 \rangle N + \langle 0, -2.94, 0 \rangle + \langle 0, 2.94, 0 \rangle = \langle 0.45, 0, 0 \rangle N$$ | $$\vec{F}_{net} = \sum \vec{F}_i = \vec{F}_{fan} + \vec{F}_{Earth} + \vec{F}_{track} = \langle 0.45, 0, 0 \rangle N + \langle 0, -2.94, 0 \rangle + \langle 0, 2.94, 0 \rangle = \langle 0.45, 0, 0 \rangle N$$ |
| |
| Notice this is simply the force that the air exerts on the blades. This is the force responsible for the momentum change of the fan cart. |