1. Experiment 3
Newton's 2nd Law

2. Experiment goals Free-body Diagrams Tension
Frictional force and coefficient of friction
Retarding forces -- Magnetic retardation velocity dependence

3. Micrometer
Enlarged Scale
Distances in mm

4. Case 1: Circular scale to the left of “Halfway Point”33 35 32 34 36
Measurement = 3 mm mm = mm
Case 2: Circular scale to the right of “Halfway Point ” 32 33 34 35 36
Measurement = 3 mm mm mm = 3.84mm

5. Part 2: Motion without Drag
GLIDER
FORCE PROBE
Part 2: Motion without Drag
Find tension in the string before you release the glider and after.
Find glider acceleration and calculate tension. How does it compare to the experimental data?
FORCE PROBE
Use Glider without magnets!
Zero force probe before attaching to the glider!

6. Part 3. Frictional Forces
GLIDER
PIECE OF ALUMINUM
WEIGHT
Find the acceleration of the aluminum piece (slope of v(t) graph).
Calculate the frictional force and the coefficient of kinetic friction.

7. Air Drag

8. g Part 4. Magnetic Drag Why magnets?
A conductor moving through a magnetic field creates currents in the conductor, e.g. a generator.
These currents, in turn, generate magnetic fields that
act back on the magnets on the cart slowing it down. g
Use several different values of h
and the Glider with magnets!
Make sure cart reaches terminal velocity!
Term. Vel.
velocity
time