Load and effort

Figure, shows a lemon crushes, (a) In the diagram, mark the position of the fulcrum F and the line of action of load L and effort E. (b) Name the class of lever.

In Figure, draw a tackle to lift the load by applying the force in downward direction. (a) Mark in the diagram the direction of load L and effort E. (b) If the load is raised by 1 m, through what distance will the effot move ? (c) State the number of strands of tackle supporting the load. (d) What is the mechanical advantage of the system?

Draw a diagram of a block and tackle system of pulleys having a velocity ratio of 5. in your diagram indicate clearly the points of application and the directions of the load L and effort E. also mark the tension T in each strand.

A block and tackle system has velocity ratio 3. draw a labelled diagram of the system indicating the points of application and the direction of load L and effort E. A man can exert a pull of 200 kgf. (a) What is the maximum load he can raise with this pulley system if its efficiency is 60% ? (b) if the effort end moves a distance 60 cm, what distance does the load move ?

The diagram below shows a rod lifting a stone. (a) Mark position of fulcrum F and draw arrows to show the directions of load L and effort E. (b) What class of lever is the rod ? (c) Give one more example of the same class of lever stated in part (b). .

Label the load arm and effort arm in the figure.

Mechanical advantage (M.A.), load (L) and effort (E) are related as :

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

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.