3/7/11
Post date: Mar 07, 2011 2:33:12 PM
Bell Ringer: A 20.0 kg object acceleerates at 16.5 m/s/s at 83.5 degrees North of West when 3 forces act on it. If F1 = 455 N at 81.0 degrees North of East, and F2 = 125 N West, what is F3?
Objects on an incline
Problems are very similar to what we've been doing
To make less work for ourselves, we don't work in the X (horizontal) and Y (vertical) directions any more. Instead we work with the parallel (to the ramp) and perpendicular (to the ramp) directions.
Friction acts only in the parallel direction
Normal force acts only in the perpendicular direction
Weight is the only force that has both a parallel and a perpendicular component. To find those components, use the following equations:
Stickiest shoe contest
P.126: 23-26 due tomorrow
Quiz 6 tomorrow - equilibrium and objects on an incline
Bell ringers due tomorrow