Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 253 · 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 screw is really … (a) a bent lever (b) a kind of wheel (c) a ramp wrapped round (d) a tiny pulley
2. 2.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) time taken (d) colour of bar
3. 3.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the pulley (d) the effort
4. 4.🪝 A load of 270 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
5. 5.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
6. 6.💪 Which force is at work: a magnet picks up pins? (a) muscular force (b) friction (c) magnetic force (d) gravity
7. 7.True or false: a fixed pulley only changes direction. (a) False (b) True
8. 8.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
9. 9.True or false: kicking a football is a pull. (a) True (b) False
10. 10.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 1 (c) class 2
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
12. 12.🪝 A winch has a wheel of radius 4 cm and an axle of radius 2 cm. What effort on the wheel lifts a 140 N bucket on the axle, in newtons? (ideal)
13. 13.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.True or false: a wheelbarrow is a class 1 lever (fulcrum in the middle). (a) False (b) True
15. 15.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
16. 16.True or false: a seesaw is a class 2 lever (load in the middle). (a) False (b) True
17. 17.⚙️ Which simple machine is a chisel? (a) wheel and axle (b) screw (c) wedge (d) pulley
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
19. 19.True or false: hitting a cricket ball is a push. (a) False (b) True
20. 20.True or false: kicking a football is a push. (a) True (b) False
21. 21.⚖️ A seesaw balances. Meena (150 N) sits 2 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🏋️ A machine lifts a load of 420 N when you push with 140 N. What is its mechanical advantage (MA)?
23. 23.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 210 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
25. 25.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
26. 26.💪 A bag has a mass of 54 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
27. 27.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
28. 28.⚖️ A lever bar balances. The load is 640 N at 50 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.⚖️ A seesaw balances. Arjun (100 N) sits 1 m from the pivot on one side; Ravi (100 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
30. 30.🏋️ An 18 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
32. 32.⚙️ Which simple machine is a screw jack? (a) lever (b) screw (c) wedge (d) pulley
33. 33.💪 In a tug of war, one team pulls left with 20 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
34. 34.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
35. 35.💪 Is pulling up your socks a push or a pull? (a) a pull (b) a push
36. 36.True or false: your forearm is a class 3 lever (effort in the middle). (a) True (b) False
37. 37.⚖️ A seesaw balances. Meena (? N) sits 4 m from the pivot on one side; Asha (600 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
39. 39.True or false: a fixed pulley rises with the load. (a) False (b) True
40. 40.Which of these is a screw? (a) a wheelchair ramp (b) a playground slide (c) a bottle cap (d) a nutcracker

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