Up until now weve dealt with ideal models of situations where forces are involved. Now its time to factor in real-world elements, such as friction. Friction can be thought of as a kind of ‘anti-force; it will go directionally against the force thats being applied as a way to attempt to keep things in equilibrium and motionless. Think of a car, for example; up until now when the engine applies a force to a car that car would just coast forever because nothing is stopping it. We know that it will not in the real world, and the reason is friction. Whenever dealing with a frictional problem, its important to remember that frictions ‘goal is to prevent the applied force from moving an object (or to keep an object from flying off a circular track, as in rotational motion). Bearing this in mind will save you a lot of time with some problems where the direction of the frictional force isnt so cut and dry.
Kinetic friction acts on objects sliding against each other. Static friction acts on objects that are not sliding.
The magnitude of the frictional force is determined by the nature of the surfaces in contact and the normal force acting on the object.
The force of kinetic friction is equal to the product of the coefficient of kinetic friction and the normal force.
The force of static friction is less than or equal to the product of the coefficient of static friction and the normal force.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
This book includes a comprehensive review of the key AP Physics C concepts and targeted strategies for acing every section of the exam. Additionally, the book includes two full length practice tests with full answer explanations.
The book offers a complete review of your AP course, strategies to give you the edge on test day, and plenty of practice with AP-style test questions. It includes 2 full length practice exams modeled on the real test, 3 separate plans to fit your study stle, review material updated to the most recent tests, and all the terms and concepts you need to know.