Class 3 Lever

Q.

Class III levers have mechanical advantage less than one. Why are they then used?

1. To obtain gain in speed

2. To obtain loss in speed

3. It acts as force multiplier

4. It is used in raising a load

Q.

State the kind of lever which always has the mechanical advantage less than 1.

1. LEVER I

2. LEVER III

3. LEVER II

4. Both B and C

Q. Which of the following is not a class III lever?

1. Human arm
2. Fire tongs
3. Knife
4. Seesaw

Q. Pick the lever that acts as a speed multiplier from the following:

1. Scissors
2. Broomstick
3. Nutcracker
4. Wheelbarrow

Q.

The lever for which the mechanical advantage is less than 1 has the :

(a) fulcrum at the midpoint between the load and effort.

(b) load between the effort and fulcrum.

(c) the effort between the fulcrum and load.

(d) load and effort acting at the same point.

Q.

Class III levers have the mechanial advantage less than 1. Why are they then used ?

Q.

Explain why the mechanical advantage of the class III lever is always less than 1.

Q.

State the class of levers and the relative positions of load (L), effort (E) and fulcrum (F) in (a) a bottle opener, and (b) sugar tongs.

Q.

State the kind of lever which always has the mechanical advantage less than 1. Draw a labelled diagram of such a lever.

Q.

Draw a labelled sketch of a class III lever. Give one example of this kind of lever.