- Q4 The Diagram Shows A Design For A Crane The Crane Is Controlled By A Computer Axis Of Rotation Jib 2 4m 6 4m Steel 1 (94.67 KiB) Viewed 36 times
- Q4 The Diagram Shows A Design For A Crane The Crane Is Controlled By A Computer Axis Of Rotation Jib 2 4m 6 4m Steel 2 (36.06 KiB) Viewed 36 times
Q4. The diagram shows a design for a crane. The crane is controlled by a computer. Axis of rotation Jib 2.4m 6.4m Steel cable NNNNNNNNNNNN Pulling force Load of 6000N Motors and gears The purpose of the motors and gears is to change the pulling force in the steel cable. This is done so that the jib stays horizontal whatever the size of the load or the position of the load. Use the equation in the box to answer questions (a) and (b). moment = force x perpendicular distance from the line of action of the force to the axis of rotation (a) Calculate the moment caused by the load in the position shown in the diagram. Show clearly how you work out your answer and give the unit. Moment = (3)
(b) Calculate the pulling force that is needed in the steel cable to keep the jib horizontal. Show clearly how you work out your answer. Pulling force = N (2) (Total 5 marks)