If the coefficient of kinetic friction between a 12.0 kg crate and the floor is .30, what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force is required if the force of friction is zero?© BrainMass Inc. brainmass.com October 24, 2018, 5:56 pm ad1c9bdddf
Newton's first law states that the total force applied to a body must be zero if the body is at rest or moving with constant velocity.
In this case we have to apply this law in both vertical and horizontal directions.
The forces applied on the obect are ...
In the first case, the solution is found by applying Newton's first law in both vertical and horizontal directions.
Classical Mechanics: Crate and Friction
A student could either pull or push, at an angle of 300 from the horizontal, a 50-kg crate on a horizontal surface, where the coefficient of kinetic friction between the crate and surface is 0.20. The crate is to be moved a horizontal distance of 15 m.
(a) Compared with pushing, pulling requires the student to do
(1) less, (2) the same, or (3) more work.
(b) Calculate the minimum work required for both pulling and pushing.View Full Posting Details