A student must either push downward on a crate at an angle of below the horizontal or…
PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics
Problem
A student must either push downward on a crate at an angle of 30∘ below the horizontal or pull upward on it at 30∘ above the horizontal to start the crate sliding across the same rough floor. Which statement is most accurate?
(a) Pulling upward requires the larger applied force because part of the pull is wasted in the vertical direction.
(b) Pulling upward requires the smaller applied force because it reduces the normal force on the crate.
(c) Pushing downward requires the smaller applied force because the increased normal force produces more friction that pushes the crate forward.
(d) Both pushing and pulling require the same applied force because the coefficient of friction is unchanged.