Question

1 p
The load arm of a lever is 6 m long and its effort arm is 36 m long. What is
the effort required to lift a load of 21 N?*​

Answer 1

Effort arm length = 36 m

Load arm length = 6 m

Load = 21 N

Mechanical advantage is defined as the ratio of load to effort or length of effort arm to load arm.

or, Mechanical advantage = effort arm / load arm

or, Load / effort = effort arm / load arm

Substituing the values,

21 / effort = 36/6

21 / effort = 6

effort = 21 / 6

or, effort = 3.5 N

Therefore,the effort required to lift a load of 21 N is 3.5 N.

Answer 2

Effort arm length = 36 m

Load arm length = 6 m

Load = 21 N

Mechanical advantage is defined as the ratio of load to effort or length of effort arm to load arm.

or, Mechanical advantage = effort arm / load arm

or, Load / effort = effort arm / load arm

Substituing the values,

21 / effort = 36/6

21 / effort = 6

effort = 21 / 6

or, effort = 3.5 N

Therefore,the effort required to lift a load of 21 N is 3.5 N.