University:
The University Of Western Ontario
Course:
2223B | Organic Chemistry of Biological Molecules
Academic year:

2023
Views:

372

Pages:

1
Author:

Cole M.

Forces on Inclined Planes Inclined Plane Force Components: Need to break down force of gravity into x and y components in order to calculate normal force and other forces as well Use the correct angles when you break forces down into their component parts Force of Friction Keeping the Block Stationary: Remember, friction force is simply µN (can be either the static coefficient of friction or the kinetic coefficient of friction) → If angle of incline is increased then N is decreased The friction force always occurs opposite to the direction of acceleration if there was no friction present The coefficient of static friction is simply the ratio between the force needed in order to overcome friction and normal force of the two objects Ice Accelerating Down an Incline: Normal force is what keeps the object from moving into the object/incline that it is stacked on top of often called the contact force Force of Friction Keeping Velocity Constant: Friction force keeps matching the force in the opposing direction (static friction) until you apply enough force to overcome it Coefficient of kinetic friction applies when the object is in motion (sometimes it can be different from coefficient of static friction) → CAN be lower than the coefficient of static friction (for some reason when something is moving, it is lower than when it is at rest) Intuition of Static and Kinetic Friction Comparisons: Basically, contact forces are simply the repulsion of atoms/molecules onto one another (their electron clouds don’t like one another) The reason that µs ≥ µk is likely because once something is already moving, it doesn’t really settle into the ruts of an uneven surface while something at rest will typically settle into these little divots (5:55 in the video) Remember, once you budge the object, µs is used in order to find the overall force but IMMEDIATELY AFTER, you must use µk Also, remember that when they are for gravitational force literally just do Fg = mg (that’s it, no dividing into its components)