A person has a choice while trying to push a crate across a horizontal pad of concrete: push it at a down-ward angle of 30o, or pull it at an upward angle of 30o.
(a) Which choice is most likely to require less force on the part of the person: (1) pushing at a downward angle; (2) pulling at the same angle, but upward; or (3) pushing or pulling shouldn’t matter?
(b) If the crate has a mass of 50.0 kg and the coefficient of kinetic friction between it and the concrete is 0.750, calculate the required force to move it across the concrete at a steady speed for both situations.