## Warren Wilson
Physics.

## Fan cart and
velocity fit.

## A fan (not shown) is mounted on a low-friction cart. The thrust
of the fan exerts a force directed towards the right (or left) as
shown by the arrow. Press “play” to run the animation and
plot position, velocity, and acceleration. The thrust in Newtons is
indicated. Select
Lo Thrust , HI
thrust., or Negative thrust.
For each value of thrust, adjust the parameters in the boxes below to
obtain the best-fit equation for the velocity vs. time.

##### Acceleration graph below:

Questions:

What is the symbolic mathematical equation for
velocity vs. time for constant acceleration?

What is Newton's 2^{nd} law of motion to
calculate the acceleration of a mass if the force and mass are
known?

From the best linear fit of the velocity graph,
obtain the acceleration for each different thrust. Calculate the
mass of the cart. The mass should be identical for all "experiments"

End of mid-week assignment. Please e-mail discussions
to dcollins@warren-wilson.edu

Physlets written by Wolgang Christian and Mario Belloni of
Davidson College.