http://www.ck12.org Chapter 4. Vectors
Practice
Questions
A video demonstrating how to determine all the forces acting on a box resting on an inclined plane.
http://www.youtube.com/watch?v=yagD_4UMxrg
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/60130- What force is broken down into components in this video?
- What two components are formed from this original force?
Review
Question
- A car weighing 12,000 N is parked on a 36° slope.
(a) Find the force tending to cause the car to roll down the hill.
(b) Find the acceleration of the car rolling down the hill.
- center of gravity:The point at which the entire weight of a body may be considered to be concentrated so
that if supported at this point the body would remain in equilibrium in any position. - normal force:In mechanics, it is the component, perpendicular to the surface of contact, of the contact force
exerted on an object by, for example, the surface of a floor or wall, preventing the object from penetrating the
surface.
Vectors in one direction can be added arithmetically, and those in different directions can be added geometrically or
broken down into their components before being added. Perpendicular components of vectors have no influence
on each other, and addition of perpendicular vectors is easily accomplished with Pythagorean’s Theorem and
trigonometric functions.