1. A fishing pole is 8 feet long. What effort force must Sylvia exert at a point 2 feet from the fulcrum end to lift a 2 pound fish?
2. Ian exerts a downward force of 30.0 N and moves that end of a lever down 0.50m, thus lifting the 0.10 m.
a) What is the mechanical advantage of this ideal machine?
b) How much does the load weigh?
2007-11-02 09:38:10 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Physics
1. The moment of Sylvia must be equal or greater than of the fish
r1F1=r2F2
F1=r2F2/r1= (6x 2)/2=6lb
2. Referring to problem #1and making use of similar triangles
Energy on the one side must equal to energy on the other side
F1h1= F2gh2 (h is not a lever arm but a path along which force was exerted.
a) Ideal Mechanical Advantage (IMA)
IMA= Fr/Fe=He/Hr
Fr - Force of resistance
Fe - Force of effort
He - Distance of effort
Hr - Distance of resistance
IMA= He/Hr = 0.50/0.10=5
b) Since IMA= Fr/Fe=He/Hr
so the load weighs
Fr=IMA Fe=5 x 30.0=150.0N
2007-11-02 10:17:29 · answer #1 · answered by Edward 7 · 0⤊ 0⤋