Define fulcrum, load arm and effort arm of a lever.

Load and effort

What is an effort arm ?

Define MA in terms of load arm and effort arm.? When does MA become more than or less than 1?

Draw diagrams to illustrate the positions of fulcrum, load and effort, in each of the following : (a) A seesaw (b) A common balance (c) A nut cracker (d) Forceps.

Define a lever.

Label the load arm and effort arm in the figure.

If load is between the fulcrum and effort of a lever, it is called ____ order lever.

Answer true or false. The fulcrum lies between load and effort in a first class lever.

A man uses a crowbar of length 1.5m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance of 1 m from his hand. (a) draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their direction. (b) state the kind of lever. (c) Calculate : (i) load arm, (ii) effort arm, (iii) mechanical advantage, and (iv) the effort needed.