Mapoob University Physios this question has been customized by Nathaniel Cunning

Question

Mapoob University Physios this question has been customized by Nathaniel Cunningham at Nebraska Wesleyan University While pushing a large couch across your carpeted living room floor you want to minimize the average force applied to the couch. Which method for pushing results in the minimum average force being applied to the couch? Push the couch forward a short distance, rest, then repeat until O O finished Push the couch so that it accelerates forward at a constant rate Keep pushing the couch forward at a steady speed This would be the best method because the maximum coefficient of static friction is of kinetic friction the coefficient less than O equal to O greater than So, the applied force required to the couch's motion is relatively small maintain O increase O stop O start Previous O Check Answer Next Exit Hint

Explanation / Answer

Usually static coefficient of friction is greater than kinetic coefficient of friction.

Hence limiting frictional force (largest value of static frictional force ) is greater than kinetic frictional force.

When the couch is at rest, it needs more force to move it than when it is already in motion because in the first case we need to overcome limiting frictional force and in the second case we need to overcome kinetic frictional force.

Hence it is easier to keep pushing the couch at steady speed than to bring it to rest and push it again.

Hence the applied force to maintain the couch's motion is relatively small.

Related Questions

Navigate

• Browse (All)
• Browse M
• Subjects

---