Effect of area of contact on frictional force in Friction – Class 8 Science Experiment

Chapter Name: Friction

Activity Name: Effect of area of contact on frictional force in Friction

Activity Description:

Effect of area of contact on frictional force in Friction - Class 8 Science Experiment

In this experiment, we investigate the effect of the area of contact on the frictional force between two surfaces.

We use a spring balance to measure the applied force required to move a brick horizontally, and then we compare the frictional forces in two different scenarios: with one brick and with two bricks stacked together.

Required Items:

  1. Brick(s)
  2. String
  3. Spring balance
  4. Flat surface

Step by Step Procedure:

  1. Tie a string securely around the brick.
  2. Place the brick on a flat surface.
  3. Attach the spring balance to the string.
  4. Pull the brick horizontally using the spring balance until the brick just begins to move. Note down the reading on the spring balance.
  5. Record the applied force reading on the spring balance.

Experiment Observations:

  1. With one brick: Note down the reading on the spring balance when the brick just begins to move.
  2. With two bricks stacked: Place another brick over the brick tied to the spring balance or press it vertically with your hand, then measure the force of friction as described above.


  1. Ensure the string is tightly secured around the brick to avoid slipping.
  2. Use a flat surface to conduct the experiment for accurate measurements.
  3. Take multiple readings to ensure the consistency of results.

Lesson Learnt from Experiment:

The experiment demonstrates that the frictional force between two surfaces is affected by the normal force (the force pressing the surfaces together). When we increase the normal force by adding an extra brick or pressing vertically, the frictional force also increases. This observation leads to the conclusion that friction is proportional to the normal force, represented as Friction ∝ Normal Force.

Science Experiment Kits for Kids

Photo Title Price Buy
Einstein Box Junior...image Einstein Box Junior Science Gift Set | 2-in-1 Set of My First Science Kit & Slime Kit for 4-6-8 Year Olds| Birthday Gift for Boys & Girls ₹1,199.00
ButterflyEdufields 20+ Science...image ButterflyEdufields 20+ Science Kit For Kids | STEM Projects birthday gift For Boys and Girls Ages 7-8-10-12 |DIY Educational & Learning Experiment Toys for 7 To 12 Year Olds | Build 20+ Motor Machines ₹1,599.00
The Little Ones...image The Little Ones Science Kit - Science experiment kit for kids 6-8-10-12 years old,educational learning toys,Best gift for boys&girls,chemistry kit,science project[Complete science kit- 100+experiment]
WitBlox AI Artificial...image WitBlox AI Artificial Intelligence Robotic Science Kit for 101+ Project 137 Part 8 Yrs+, Interlocking Bricks, Electronic Sensor & Circuits to create Logic 2 Free Live Classes Gift Toy for Boys & Girls ₹3,499.00
Avishkaar Robotics Advanced...image Avishkaar Robotics Advanced Kit|150-In-1 DIY Stem Metal Kit|Multicolor|150+ Parts|Learn Robotics|Coding & Mechanical Design|for Kids Aged 10-14|Made in India|Educational DIY Stem Kit|Made in India ₹10,499.00
My Science Lab...image My Science Lab Ultimate Science Experiment Kit for Kids Age 6-14 | STEM Toys | Physics Kit Set | Science & Fun 5-in-1 Projects | School Science Kit | Best Educational Birthday Gift Toys for Boys and Girls

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *