Friction Pen

Heat of friction causes ink in “Frixion” erasable pens to disappear.

Ink reappears when exposed to cold temperatures.

Use lighter for high temp. (Be careful not to burn paper. Just wave flame in front of paper until ink disappears)

Use liquid from compressed air to achieve cold temperatures. (Invert can and spray. Be careful not to get liquid on skin. Extremely cold.)

Static Friction Incline

Friction prevents the metal washer on incline from slipping. Washer will begin to slide down plane when angle is great enough (one can show that the coefficient of friction is equal to the tangent of the angle when the washer just begins to slip). Materials include: rubber, glass, wood, and teflon.
Use angle ruler (shown in photo) to measure angle.
Materials located in L02, section B3. Angle ruler in L45, with rulers.

Used in uniform circular motion lab, coeficient of static
friction is calculated and then used to predict maximum rpm at which car will
remain on table.
Adjust rpm with 5 amp, regulated DC power supply.

Location

Used in uniform circular motion lab, coefficient of static
friction is calculated and then used to predict maximum rpm at which car will
remain on table.
Adjust rpm with 5 amp, regulated DC power supply.

Location

Purpose: Used in Uniform Circular Motion lab to help illustrate
principles of friction and centripetal force.
Located in L03, section B3

Demonstrate Kinematics of frictionless motion; experiment
with Newton’s 2nd Law; study conservation of momentum.
Sit on craft with center of gravity directly over center
of disk; make sure battery is charged to full capacity.
Located in L02.

Perform various experiments dealing with static equilibrium,
resolution of concurrent forces, levers, torque, inclined planes, mechanical
advantage, pulleys, physical pendulums, spring systems, center of mass, and
friction.
Mount on blackboard surface by means of magnets: levers,
inclined plane, pulleys, simple machines, roller, friction block, weights,
springs and scales. Check out the Klinger
website for ideas.
Located in L02, section B4