Question 11 mark
A child's swing moves backwards and forwards in an arc. Which type of motion is this?
OCR 6.3 · Core technical principles
Mechanical devices, levers and gears
Questions on every material. · The lesson
1 of 6
Question 21 mark
In a wheelbarrow the wheel is the fulcrum and the load sits between the wheel and the handles. Which class of lever is it?
Question 31 mark
A motor turns a 15-tooth driver gear at 1200 rpm. It meshes with a 45-tooth driven gear. How fast does the driven gear turn?
Structured question 17 marks
A workshop lifting arm
A first class lever lifts a 600 N load. The load is 0.2 m from the fulcrum and the effort is applied 0.6 m from the fulcrum on the other side. The arm is reset by a motor driving a 40 mm pulley at 900 rpm, linked by a belt to a 120 mm pulley.
(a) Calculate2 marks
Calculate the effort needed to balance the load.
N
(b) Calculate1 mark
Calculate the mechanical advantage of the lever.
(c) Calculate2 marks
Calculate the speed of the 120 mm pulley.
rpm
(d) Explain2 marks
Explain one advantage of a toothed belt over a plain belt on this arm.
0 words
Structured question 26 marks
Choosing a mechanism
A designer is making a wooden toy in which a handle is turned and a bird on top moves up and down.
(a) Evaluate6 marks
Evaluate the use of a cam and follower for this toy.
0 words
Question 41 mark
A cable pulls along a bicycle frame and must move a brake arm at right angles to the pull. Which linkage turns a movement through 90°?