Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 598 · 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.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) False (b) True
2. 2.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Kabir (190 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
4. 4.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) a wheel on ball bearings (d) a wet tiled floor
5. 5.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) friction (c) magnetic force (d) gravity
6. 6.True or false: a round doorknob is a pulley. (a) True (b) False
7. 7.⚖️ A seesaw balances. Kabir (? N) sits 1 m from the pivot on one side; Ravi (180 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
8. 8.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
9. 9.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a bent lever (d) a kind of wheel
10. 10.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) False (b) True
11. 11.⚖️ What is the pivot point of a lever called? (a) the axle (b) the load (c) the effort (d) the fulcrum
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
13. 13.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 20 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.⚖️ A lever bar balances. The load is 800 N at 50 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.🪝 A pulley system lifts a 1080 N load with an effort of 270 N. What is its mechanical advantage (MA)?
16. 16.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
17. 17.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
18. 18.💪 Two children push a box to the right, one with 40 N and the other with 95 N. What is the net (total) force on the box, in newtons?
19. 19.⚖️ A seesaw balances. Meena (560 N) sits ? m from the pivot on one side; Asha (560 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
20. 20.⚖️ Turning effect = force × … (a) mass of fulcrum (b) distance from fulcrum (c) colour of bar (d) time taken
21. 21.⚙️ Which simple machine is a playground slide? (a) wedge (b) screw (c) wheel and axle (d) inclined plane
22. 22.🪝 A bucket weighing 150 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
23. 23.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
24. 24.💪 In which unit do we measure force? (a) second (s) (b) newton (N) (c) metre (m) (d) litre (L)
25. 25.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) magnetic force (c) muscular force (d) friction
26. 26.⚖️ A lever bar balances. The load is 80 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?
27. 27.🏋️ A force of 110 N pushes a cart 6 m along the floor. How much work is done, in joules?
28. 28.🏋️ Pushing a crate 8 m took 320 J of work. What force was used, in newtons?
29. 29.🪝 A pulley system lifts a 1040 N load with an effort of 260 N. What is its mechanical advantage (MA)?
30. 30.True or false: a playground slide is a wheel and axle. (a) True (b) False
31. 31.True or false: a movable pulley halves the effort. (a) True (b) False
32. 32.💪 Two children push a box to the right, one with 20 N and the other with 95 N. What is the net (total) force on the box, in newtons?
33. 33.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a crane hook block (c) a flagpole rope wheel (d) a jar lid
34. 34.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Zoya (130 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.Which of these is caused by muscular force? (a) squeezing a lemon (b) a magnet picks up pins (c) an apple falls down (d) rain falls to the ground
36. 36.Which of these is a screw? (a) a well winch handle (b) a jar lid (c) a playground slide (d) a crowbar
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
38. 38.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Kabir (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.🏋️ A force of 220 N did 880 J of work. How many metres did the object move?
40. 40.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) more effort needed (d) the load floats

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