Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 821 · 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 of these is an inclined plane? (a) a screw jack (b) a round doorknob (c) a wheelchair ramp (d) the tip of a nail
2. 2.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 150 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.⚖️ A seesaw balances. Arjun (760 N) sits ? m from the pivot on one side; Asha (190 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
4. 4.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) muscular force (c) friction (d) magnetic force
5. 5.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) balanced (c) unbalanced (d) doubled
6. 6.⚖️ A lever bar balances. The load is 700 N at ? cm from the fulcrum. The effort is 500 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
7. 7.True or false: a movable pulley is on a flagpole top. (a) True (b) False
8. 8.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
9. 9.💪 A cart is pulled to the right with 20 N and to the left with 35 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
10. 10.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
11. 11.💪 A bag has a mass of 39 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
12. 12.Which of these is a screw? (a) a window blind cord (b) a wood screw (c) a claw hammer on a nail (d) an axe blade
13. 13.True or false: a grippy rubber sole gives less friction. (a) False (b) True
14. 14.True or false: a pair of tweezers is a class 1 lever (fulcrum in the middle). (a) False (b) True
15. 15.🏋️ Pushing a crate 9 m took 2880 J of work. What force was used, in newtons?
16. 16.True or false: a box pushed on carpet gives more friction. (a) True (b) False
17. 17.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 120 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.True or false: a fixed pulley stays in one place. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) a door stopper (b) the tip of a nail (c) a chisel (d) a water tap handle
20. 20.True or false: the tip of a nail is a wedge. (a) False (b) True
21. 21.⚖️ Which class of lever is a beam balance? (a) class 1 (b) class 2 (c) class 3
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
23. 23.🪝 A bucket weighing 90 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
24. 24.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
26. 26.⚖️ A lever bar balances. The load is 40 N at 10 cm from the fulcrum. The effort is ? N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) chalk on a gym bar (d) a smooth steel slide
29. 29.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
30. 30.🏋️ A machine lifts a load of 570 N when you push with 190 N. What is its mechanical advantage (MA)?
31. 31.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
32. 32.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
33. 33.🏋️ A force of 60 N pushes a cart 6 m along the floor. How much work is done, in joules?
34. 34.True or false: a grippy rubber sole gives more friction. (a) True (b) False
35. 35.True or false: a door stopper is a wedge. (a) True (b) False
36. 36.🏋️ A 4 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
37. 37.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
38. 38.True or false: opening a drawer is a pull. (a) False (b) True
39. 39.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Asha (220 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold

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