Refraction of Light
Send a ray from one medium into another and watch it bend.
Projectile Motion
Choose a launch speed and angle, then launch and compare with the formulas.
Simple Pendulum
Change the length, gravity and starting angle, and time the swing.
Spring–Mass Oscillator
Hang any load on a helical spring, pull it down, time the oscillations with a stopwatch and find the force constant and effective mass of the spring from your own readings.
Surface Tension by Capillary Rise
Dip a fine glass tube in a liquid, read the meniscus and the needle tip with a travelling microscope, and work out the surface tension from your own readings.
Newton's Law of Cooling
Let a hot liquid cool in a calorimeter, read the thermometer at fixed intervals and plot the cooling curve. Choose any liquid, any amount, any room, with a fan, a lid or cotton-wool lagging.
Sonometer: Law of Length
Move the bridges until the wire resonates with each tuning fork and show that n × l stays constant. Any fork, any load, any wire.
Sonometer: Law of Tension
Keep one tuning fork, change the load on the hanger and show that T / l² stays constant. Any fork, any load, any wire.
Resonance Tube: Speed of Sound
Lower the water in a resonance tube, hunt for the loud points for each tuning fork, and work out the speed of sound and the end correction from your own readings. Any fork, any temperature, any tube, any gas.
Angle of Contact and the Meniscus
Change the angle of contact and watch the liquid surface in a capillary tube go from concave to flat to convex, and the column rise or fall.