Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 642 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.⚖️ A seesaw balances. Asha (300 N) sits 1 m from the pivot on one side; Kabir (100 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
2. 2.True or false: powder on a carrom board gives more friction. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) a seesaw (b) a truck loading ramp (c) a wheelchair ramp (d) a road up a hill
4. 4.Which of these is caused by magnetic force? (a) a compass needle turns (b) a thrown ball comes down (c) pedalling a cycle (d) rain falls to the ground
5. 5.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
6. 6.⚖️ A lever bar balances. The load is 300 N at 30 cm from the fulcrum. The effort is 300 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) through a distance (d) without moving it
8. 8.True or false: a claw hammer on a nail is a lever. (a) False (b) True
9. 9.Which of these is a lever? (a) a knife edge (b) a jar lid (c) a seesaw (d) a chisel
10. 10.True or false: a bottle opener is a class 1 lever (fulcrum in the middle). (a) True (b) False
11. 11.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
12. 12.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 30 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) the tip of a nail (b) a knife edge (c) a bottle opener (d) a door stopper
15. 15.⚖️ Turning effect = force × … (a) mass of fulcrum (b) colour of bar (c) time taken (d) distance from fulcrum
16. 16.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a flat ramp (d) a smaller rod (axle)
17. 17.Which of these is an inclined plane? (a) a round doorknob (b) a window blind cord (c) a nut and bolt (d) a wheelchair ramp
18. 18.🪝 A load of 330 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
20. 20.True or false: a tyre with deep treads gives less friction. (a) True (b) False
21. 21.True or false: a bottle opener is a wheel and axle. (a) False (b) True
22. 22.True or false: a screw jack is an inclined plane. (a) False (b) True
23. 23.⚙️ Which simple machine is a truck loading ramp? (a) wedge (b) lever (c) inclined plane (d) wheel and axle
24. 24.True or false: a box pushed on carpet gives less friction. (a) True (b) False
25. 25.💪 A box weighs 70 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
26. 26.🏋️ A machine lifts a load of 800 N when you push with 160 N. What is its mechanical advantage (MA)?
27. 27.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
28. 28.🪝 A load of 480 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
29. 29.⚖️ A lever bar balances. The load is 100 N at 20 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.🪝 A winch has a wheel of radius 35 cm and an axle of radius 5 cm. What effort on the wheel lifts a 980 N bucket on the axle, in newtons? (ideal)
31. 31.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 0 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
33. 33.🪝 A bucket weighing 230 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.⚙️ Which simple machine is a water tap handle? (a) inclined plane (b) pulley (c) wheel and axle (d) lever
35. 35.True or false: pulling a cart is a push. (a) True (b) False
36. 36.Which of these is a lever? (a) a flagpole rope wheel (b) a bottle cap (c) a playground slide (d) a nutcracker
37. 37.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
38. 38.True or false: a chisel is a pulley. (a) True (b) False
39. 39.🏋️ A machine lifts a load of 240 N when you push with 40 N. What is its mechanical advantage (MA)?
40. 40.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem

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