Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 456 · 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 class of lever is a broom when sweeping? (a) class 3 (b) class 2 (c) class 1
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
3. 3.🏋️ Pushing a crate 8 m took 320 J of work. What force was used, in newtons?
4. 4.💪 Which force is at work: shoes grip the floor? (a) muscular force (b) gravity (c) magnetic force (d) friction
5. 5.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) the load floats (d) less effort needed
6. 6.Which of these is a pulley? (a) the tip of a nail (b) a chisel (c) a screw jack (d) a crane hook block
7. 7.🏋️ A machine lifts a load of 660 N when you push with 110 N. What is its mechanical advantage (MA)?
8. 8.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
9. 9.⚙️ Which simple machine is a window blind cord? (a) screw (b) pulley (c) wheel and axle (d) lever
10. 10.True or false: pressing a doorbell is a pull. (a) True (b) False
11. 11.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the load (d) the pulley
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
13. 13.⚖️ A seesaw balances. Meena (200 N) sits 1 m from the pivot on one side; Zoya (100 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a rough doormat (d) a tyre with deep treads
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 10 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
17. 17.⚖️ A lever bar balances. The load is 490 N at ? cm from the fulcrum. The effort is 140 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.💪 Two children push a box to the right, one with 55 N and the other with 55 N. What is the net (total) force on the box, in newtons?
19. 19.⚖️ A seesaw balances. Meena (260 N) sits 2 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🏋️ A machine lifts a load of 120 N when you push with 40 N. What is its mechanical advantage (MA)?
21. 21.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
22. 22.💪 Which can a force NOT do? (a) change its shape (b) stop it moving (c) change its colour (d) start it moving
23. 23.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
24. 24.🪝 A well winch has a handle (wheel) of radius 12 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
25. 25.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) True (b) False
26. 26.🏋️ A force of 350 N pushes a cart 5 m along the floor. How much work is done, in joules?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
28. 28.True or false: sand on a slippery path gives less friction. (a) True (b) False
29. 29.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the effort (c) nothing (d) the fulcrum
30. 30.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Kabir (390 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.💪 A box weighs 190 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
32. 32.🪝 A load of 40 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
33. 33.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
34. 34.🪝 A pulley system lifts a 570 N load with an effort of 190 N. What is its mechanical advantage (MA)?
35. 35.🪝 A pulley system lifts a 1200 N load with an effort of 300 N. What is its mechanical advantage (MA)?
36. 36.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
37. 37.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
38. 38.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 210 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
40. 40.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem

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