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Friction - Lab report

Lab report
Course

College Phy Lab I (PHY 106)

11 Documents
Students shared 11 documents in this course
Academic year: 2020/2021
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University of Miami

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Friction

Purpose: The purpose of this experiment is to determine μs and μk and to understand static and kinetic

friction.

Theory: Static friction is a frictional force which resists force that is applied to a particular object. Hence

the object stays at rest. The object only moves if the force of the static friction is overcome. For example, someone pushing a couch without it moving. If they push harder, it might overcome the

static friction force and move. The coefficient of friction is μs. The equation of static friction is Fs ≤ μs x Fn where Fs = force of static friction in newtons (N), μs = coefficient of static friction and Fn = normal force in newtons (N).

The second type of frictional force is the kinetic friction. There is resistance to motion because of the object’s and surface’s contact. It acts in the opposite direction of motion. If someone is pushing an object forward, the friction pushes it backwards. Kinetic friction is only used when the object is moving. For example, pushing a box across a plank. The equation of kinetic friction is Fk ≤ μk x Fn where Fs = force of kinetic friction in newtons (N), μk = coefficient of kinetic friction and Fn = normal force in newtons (N).

Apparatus:

  1. Extension spring with attached loop and carabiner,
  2. Ruler, 30 cm,
  3. Digital Scale,
  4. Tape measure,
  5. Plastic water bottle 0 liter,
  6. Masking tape,
  7. Letter size sheet of paper,
  8. String.

Calculations:

Graph 1: spring extension vs pulling force from the data of spring calibration.

Graph 2: static friction force vs the normal force. The μs from the slope is determined below.

Discussion: We obtained the coefficient factor of static friction as 0 and kinetic friction as 0.

Errors in the experiment could have resulted due to many sources. A human error could be made while taking the measurements with the ruler. In the spring calibration experiment, the spring has

to be stable and not bouncing to take the measurement which can be difficult. We can improve the accuracy of measurements by doing more trials.

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Friction - Lab report

Course: College Phy Lab I (PHY 106)

11 Documents
Students shared 11 documents in this course

University: University of Miami

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Friction
Purpose:
The purpose of this experiment is to determine µs and µk and to understand static and kinetic
friction.
Theory:
Static friction is a frictional force which resists force that is applied to a particular object. Hence
the object stays at rest. The object only moves if the force of the static friction is overcome. For
example, someone pushing a couch without it moving. If they push harder, it might overcome the
static friction force and move. The coefficient of friction is µs. The equation of static friction is
Fs ≤ µs x Fn where Fs = force of static friction in newtons (N), μs# = coefficient of static friction
and Fn# = normal force in newtons (N).
The second type of frictional force is the kinetic friction. There is resistance to motion because of
the object’s and surface’s contact. It acts in the opposite direction of motion. If someone is
pushing an object forward, the friction pushes it backwards. Kinetic friction is only used when
the object is moving. For example, pushing a box across a plank. The equation of kinetic friction
is Fk ≤ µk x Fn where Fs = force of kinetic friction in newtons (N), μk# = coefficient of kinetic
friction and Fn# = normal force in newtons (N).

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