Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 708 · 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.💪 In which unit do we measure force? (a) second (s) (b) newton (N) (c) litre (L) (d) metre (m)
2. 2.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
3. 3.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
4. 4.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
5. 5.⚖️ A lever bar balances. The load is 200 N at 30 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?
6. 6.True or false: a rough doormat gives more friction. (a) True (b) False
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
9. 9.True or false: a fixed pulley needs effort = load. (a) True (b) False
10. 10.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 2 (c) class 1
11. 11.⚙️ A wedge is … (a) a rope on a wheel (b) a bar on a pivot (c) a wheel on a rod (d) two ramps back to back
12. 12.Which of these is a wedge? (a) a playground slide (b) a wood screw (c) the tip of a nail (d) a seesaw
13. 13.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 50 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.True or false: a fixed pulley only changes direction. (a) False (b) True
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
17. 17.⚖️ A lever bar balances. The load is 400 N at 20 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?
18. 18.🔍 Which is the odd one out? (a) a round doorknob (b) a well winch handle (c) a steering wheel (d) a flagpole rope wheel
19. 19.True or false: a rough doormat gives less friction. (a) True (b) False
20. 20.⚖️ A seesaw balances. Arjun (240 N) sits 4 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.True or false: a smooth steel slide gives more friction. (a) True (b) False
22. 22.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 360 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
23. 23.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) the pulley
24. 24.True or false: a grippy rubber sole gives more friction. (a) False (b) True
25. 25.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
26. 26.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
27. 27.🏋️ A 10 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
28. 28.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
29. 29.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
30. 30.Which of these is a pulley? (a) a bottle opener (b) a screw jack (c) a flagpole rope wheel (d) a steering wheel
31. 31.True or false: pulling up your socks is a push. (a) False (b) True
32. 32.🪝 A load of 450 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
34. 34.💪 Two children push a box to the right, one with 10 N and the other with 60 N. What is the net (total) force on the box, in newtons?
35. 35.🪝 More rope sections holding a load means … (a) no change (b) less effort needed (c) the load floats (d) more effort needed
36. 36.💪 Which force is at work: pedalling a cycle? (a) gravity (b) magnetic force (c) muscular force (d) friction
37. 37.💪 Which force is at work: shoes grip the floor? (a) gravity (b) muscular force (c) friction (d) magnetic force
38. 38.🪝 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)
39. 39.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
40. 40.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids