Below are sample standard word problems involving application of Newton's laws of motion.
1. A box with mass 10.5 kg moves on a ramp that is inclined at an angle of 50.0∘ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is μk = 0.310. Calculate the magnitude of the acceleration of the box if you push on the box with a constant force F = 125.0 N that is parallel to the ramp surface and directed up the ramp, moving the box up the ramp.
2. A 60.0-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.760 and 0.410, respectively. What horizontal pushing force is required to just start the crate moving and slide the crate across the dock at a constant speed? Note: Two FBDs will be provided here. The first FBD is for the crate that is about to move and the second FBD is for the crate that is already in motion at a constant speed.
Disregard the calculation part, your task is to (a) identify the forces acted on the object (in bold) and (b) draw its FBD. For Part A, you will be graded based on the correctly identified force. For each wrongly identified force, it will be deducted from your correct ones. For Part B, you will be graded based on the accuracy and completeness of your FBD with 5 points as the maximum score and 0 point as the lowest score.