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# grade 12 physics formula sheet

Question:

Answers:I did my +1 and +2 in 1993 and 1994. At that time I purchased a book titled "Mathematics - A Hand Book" which was priced around Rs.30/- and it contained all the formulas, definitions and important material. I purchased that from a local shop at that time. You can now try the same thing from a local shop, it may cost you less that 100/- now, but its worth. All the best dude. z

Question:In many neighborhoods, you might see parents pulling youngsters in a four-wheeled wagon. The child and the wagon have a combined mass of 50 kg and the adult does 2.2x10^3 J of work pulling the two 60 m at a constant speed. The coefficient of friction for the surfaces in contact is 0.26 a) determine the magnitude of force applied by the parents b) determine the angle that the parent is applying the force

Answers:I disagree with your first answer. The 2.2x10^3 J of work go to overcoming friction. So that energy is consumed by the friction. 2.2x10^3 J of work = Friction force*distance = Friction force*60 m. So Friction force = 2.2x10^3 J / 60 m = 36.7 Newtons The formula for Friction force Friction force = uN = 0.26 x N Where N is the normal force. N = 141 Newtons The weight of the child and wagon are more than that. So the parent is somewhat lifting the load, so the normal force used in the friction calculation is decreased. The normal force is the net vertical force -- the difference between the weight (of child and wagon) and the vertical component of the parent's force Normal force = 141 Newtons = m*g - F*sin(w) = 50 kg*9.8 m/s^2 - F*sin(w) F*sin(w) = (490 - 141) Newtons = 349 Newwtons F = 349 Newtons / sin(w) We can also say that the parent's work done is given by force applied * the distance traveled * angle between these 2 vectors 2.2x10^3 J = F * 60 m * cos(w) F = 2.2x10^3 J / (60 m * cos(w)) = 36.7 Newtons / cos(w) Setting the 2 expressions for F equal to each other F = 349 Newtons / sin(w) = 36.7 Newtons / cos(w) cos(w)/sin(w) = 36.7/349 cot(w) = .105 w = 84 degrees I think the parent needs a longer handle on the wagon.

Question:Im lookin for a web page or something that can give me a whole list of grade 12 physics equations from each unit,,, my final exam is comin up and i need a list... thx