Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
WORK AP 1 chapter 6: section 6.1-6.2 WORK The product of the magnitude of the displacement times the component of the force PARALLEL to the direction of motion. Scalar but can be negative or positive (lose or gain) W=F”d =FdcosӨ Ө is the angle between the force and the direction of motion. Units are Newton-meter (Nm)= Joule (J) WORK CAN BE Done by the object (-W) Done on the object (+W) Done by a specific force (must name it) Done by a Net force A PERSON PULLS A 50 KG CRATE 40 M ALONG A HORIZONTAL FLOOR BY A CONSTANT FORCE OF 100N ACTING AT A 37°ANGLE. THE FLOOR IS ROUGH AND EXERTS A FRICTIONAL FORCE OF 50N. Wg done by gravity =mgdcosӨ = 0 Find the work done by each force. WN done by FN FN Fa =FNdcosӨ = 0 Wa done by person =FadcosӨ= 100N(40m)cos 37 =3200J Ff Fg Wf done by friction =FfdcosӨ= 50N(40m)cos180 = -2000J NET WORK ON CRATE FN Ff Fg Fa Wnet= sum of all work =0J + 0J +3200J + -2000J =1200 J OR Wnet= Fnetd =(Fa-Ff)d =(100cos37-50)(40m) FORCE VS DISPLACEMENT Work is the area under the curve. F” (N) A=length*width=F”d=W A=1/2(p+q)h trapezoid d (m) A=1/2*base *height =1/2dF” =-W