Preliminary questions: In pushing a heavy box across the...

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Ernesto Leyva PHY-2048L Lab 6 “Investigating Static and Kinetic Frictions.” Whenever two surfaces that are in contact with each other try to move pass one another there is a force that resists the motion. In some case you could push on an object trying to move it and the object doesn’t move. The force of static friction f s balances your force. This is because in order to move an object you need to apply a force larger or equal to the maximum possible static friction, f smax .Once moving the object still offers some resistance and if you stop pushing the object will immediately start to slow down to a stop, the force responsible for this behavior is the force of kinetic friction, f k . In this experiment, we will use a Force Sensor to study static friction and kinetic friction on a tray. Purpose To find the graphical and mathematical relationship between the forces of maximum static and kinetic frictions and the normal force on the objects, as to determine the coefficients of static and kinetic frictions for the surface being studied. Preliminary questions: In pushing a heavy box across the floor, is the force you need to apply to start the box moving greater than, less than, or the same as the force needed to keep the box moving? Explain your answer.
How do you think the force of friction is related to the weight of the box? Explain.
Create a force or free body diagram for the case when you are pushing on the box without moving it and when it slides across the floor at a constant velocity.
Ernesto Leyva PHY-2048L Apparatus and Procedure Independent variable: Normal Force Dependent Variable: Friction force Materials: Computer with Logger Pro; Lab Pro with dual range force sensor; Ramp; Mass sets;