Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 98 · 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.⚙️ Which simple machine is a well-bucket rope wheel? (a) wedge (b) pulley (c) inclined plane (d) lever
2. 2.⚖️ A seesaw balances. Meena (480 N) sits ? m from the pivot on one side; Arjun (320 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 60 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
4. 4.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 40 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.⚖️ A seesaw balances. Ravi (120 N) sits 1 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.⚙️ Which simple machine is a bottle opener? (a) inclined plane (b) screw (c) pulley (d) lever
7. 7.🪝 A load of 540 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.True or false: a playground slide is a lever. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
11. 11.True or false: a movable pulley halves the effort. (a) True (b) False
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 2 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
14. 14.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
15. 15.True or false: a fixed pulley rises with the load. (a) True (b) False
16. 16.🏋️ A force of 80 N did 240 J of work. How many metres did the object move?
17. 17.🪝 A load of 300 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.True or false: a movable pulley needs effort = load. (a) False (b) True
20. 20.Which of these is a screw? (a) a bottle cap (b) a knife edge (c) a wheelchair ramp (d) a chisel
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
22. 22.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a kind of wheel (d) a tiny pulley
23. 23.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) a window blind cord (b) a road up a hill (c) a wheelchair ramp (d) a playground slide
25. 25.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
26. 26.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) the axle
27. 27.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
28. 28.💪 A bag has a mass of 22 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
29. 29.⚖️ A lever bar balances. The load is 160 N at 50 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
30. 30.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
31. 31.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a rough doormat (d) oil on a squeaky hinge
32. 32.🪝 A load of 560 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
34. 34.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the effort (d) the load
35. 35.⚖️ A seesaw balances. Ravi (540 N) sits ? m from the pivot on one side; Kabir (180 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
36. 36.🏋️ A force of 110 N pushes a cart 1 m along the floor. How much work is done, in joules?
37. 37.⚙️ Which simple machine is a wheelchair ramp? (a) inclined plane (b) lever (c) pulley (d) screw
38. 38.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) distance from fulcrum (d) colour of bar
39. 39.⚖️ A lever bar balances. The load is 240 N at 20 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort

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