Friction is a force that resists motion. It involves objects in contact with each other, and it can be either useful or harmful. Friction helps when you want to slow or stop a bicycle, but it is harmful when it causes wear on the parts of a machine. In this activity, you will study the effects of surface smoothness and the nature of materials in contact on sliding friction. You will use a computer-interfaced Force Sensor to measure frictional force, in Newtons (N), as you pull a block across different surfaces.
In this experiment, you will
Measure sliding friction.
Measure friction between a wooden block and smooth-surface wood.
Measure friction between a wooden block and rough-surface wood.
Make predictions about other surfaces.
Test your predictions.
Sensors and Equipment
This experiment features the following Vernier sensors and equipment.