Explain why scissors for cutting cloth may have blades longer than the handles, but shears for cutting metals have short blades and long handles. Open Answer »
Derive a relationship between mechanical advantage, velocity ratio and efficiency of a machine Open Answer »
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. Open Answer »
Both a pair of scissors and a pair of pliers belong to the same class of levers. Name the class of lever. Which one has the mechanical advantage less than 1? Open Answer »
Name the three classes of levers and state how are they distinguished. Give two examples of each class. Open Answer »
State one reason why mechanical advantage is less than the velocity ratio for an actual machine. Open Answer »
(a) State the relationship between mechanical advantage, velocity ratio and efficiency. (b) Name the term that will not change for a machine of a given design. Open Answer »
When does a machine act as (a) a force multiplier (b) a speed multiplier? Can a machine act as a force multiplier and speed multiplier simultaneously? Open Answer »
