A lever with an effort arm of 10 meters and a load arm of 2 meters is used to lift an object
weighing 220 Newtons to a height of 4 meters. If 400Joules of work is done, how much force
must have been applied? ]
4000 N
800 N
100 N
1600 N
800 N
The formula for calculating work done by a lever is:
Effort x Effort arm = Load x Load arm
Given Effort arm = 10m, Load arm = 2m, Load = 220 N, and Work done = 400 J:
Effort x 10m = 220 N x 2m
Effort = (220 N x 2m) / 10m
Effort = 440 N / 10m
Effort = 44 N
Now we can calculate the force that was applied to lift the object:
Work = Force x Distance
400 J = Force x 4m
Force = 400 J / 4m
Force = 100 N
Therefore, the force applied to lift the object was 100 N, which is the correct answer.