Friction – 1K20.00

Friction Blocks – Surface Materials – 1K20.10

  • Measure static friction by noting the scale reading just before the block slides.
  • Measure sliding friction by pulling the block at a constant speed.
  • Change the surface materials and note the different frictions.

Friction Blocks 1K20_10

Static vs. Sliding Friction – 1K20.30

Static and Sliding Friction 1K20_30

  • Pull on a block with a spring scale until just before the block moves.
  • Note the reading on the spring scale.
  • Pull the block slowly across the table.
  • Compare the spring scale readings.

Location: Demo Room

Inclined Plane – Friction – 1K20.35

Inclined Plane 1K20_35

  • Set an empty box on the inclining plane
  • Increase the angle until it slides.
  • Add weights to the box and repeat the experiment.
  • The weighted box begins to slide at the same angle.
  • This shows that the coefficient of friction does not depend upon the mass of the object.

Location: Demo Room

Friction and Cord Around a Cylinder – 1K20.71

  • Suspend two different masses with a cord around a fixed cylinder so that the masses are in equilibrium
  • Add a mass on one side and observe the cord sliding.
  • Wrap the cord around the cylinder once and see that the cord does not slide.
  • Repeat adding more masses and wrapping the cord around the cylinder multiple times.
  • The result is exponential.

Location: Demo Room

Cord Around a Cylinder 1K20_70