How can we measure the magnitude of frictional force using spring balance?
Answers
Answer:
Method. One way to determine the coefficient of friction between two surfaces is to pull on an object, using a spring scale that is used to measure weight. If you lay an object on another surface and then pull it, you can determine the amount of force required to move the object.
Answer:
Spring balance
Pull a spring balance connected to the block and slowly increase the force until the block begins to slide. Make sure the spring balance is parallel to the surface. The reading on the spring balance scale when the load begins to slide is a measure for the static friction, while the reading when the block continues to slide is a measure of dynamic friction. The coefficient of friction is simply µ = Fspring /Fnormal = Fspring /(mblock ·g ), g=9.81 m/s²
Hint: Pulse rotation sensors (multi-turn potentiometers, pulse encoders) often prove to be very useful to create low cost sensors for measuring displacement by combining the sensor with a cable and a pulley, for measuring torque with a torsional spring, for measuring force with a wire, a pulley and a spring etc.