Friction Block

Return to Newton's Laws

Description:

Place masses on a wooden block and pull the block with a spring scale (or Force Probe connected to computer to plot Force vs Time). A larger force is needed to get the block moving (static vs. kinetic friction). Add mass to show friction is dependent on the normal force. Independence of surface area can be shown by placing the block on its side and show the force to make it move is the same. One block the center is hollowed out to show that friction is independent of contact surface area. Blocks with foam rubber and a rubber sheet are available to vary the coefficient of static friction.

Using the Computer and Force Probe, Plotting Force vs. time while the block is pulled, will dramatically show the difference between Static and Kinetic friction.

Location:

• Blocks: Dr. 4
• Masses: Sh. A-4
• Spring Scales: Dr. 10