The force of 25N is exerted on a lever in order to lift a can of beans. The resultant force on the lid is 57N. What is the mechanical advantage of the lever?
MA=Fout/Fin =57N/25N =2.28
Two furniture movers are trying to get a couch into the truck. It is 120N so instead of lifting it straight up they use a ramp. The ramp is 2m high and 13 m high. What is the ideal mechanical advantage?
IMA=L/H =13x2 =26
It takes 379N to drag a piano up a 7m inclined plane. If the ramp is 1.5m high and the force of gravity acting on the cart is 450N what will be the mechanical efficiency?
Wo=450Nx1.5m =67.5J
Wi=379Nx7m =2653J
ME=Wo/Wi x 100% =67.5/2653 x 100% =2.5
Why is the mechanical efficiency of a machine always less than 100%?
The mechanical efficiency of a machine is always less than 100% because of friction.
Name 2 things that will help the efficiency of a machine.
2 things that can help the efficiency of a machine is lubricants and wheels.
- The force of 25N is exerted on a lever in order to lift a can of beans. The resultant force on the lid is 57N. What is the mechanical advantage of the lever?
MA=Fout/Fin=57N/25N
=2.28
- Two furniture movers are trying to get a couch into the truck. It is 120N so instead of lifting it straight up they use a ramp. The ramp is 2m high and 13 m high. What is the ideal mechanical advantage?
IMA=L/H=13x2
=26
- It takes 379N to drag a piano up a 7m inclined plane. If the ramp is 1.5m high and the force of gravity acting on the cart is 450N what will be the mechanical efficiency?
Wo=450Nx1.5m=67.5J
Wi=379Nx7m
=2653J
ME=Wo/Wi x 100%
=67.5/2653 x 100%
=2.5
- Why is the mechanical efficiency of a machine always less than 100%?
The mechanical efficiency of a machine is always less than 100% because of friction.- Name 2 things that will help the efficiency of a machine.
2 things that can help the efficiency of a machine is lubricants and wheels.Other Pages...
Clarissse's page on The Inclined Plane and the Lever
Clarisse's page on Levers
Clarisse's quiz for the inclined plane and the lever