Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 282 · 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 lever bar balances. The load is 630 N at 50 cm from the fulcrum. The effort is 350 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.⚖️ A seesaw balances. Asha (680 N) sits ? m from the pivot on one side; Kabir (170 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
3. 3.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the bar is short (d) the fulcrum moves
4. 4.True or false: a movable pulley needs effort = load. (a) True (b) False
5. 5.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (800 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.💪 A box weighs 430 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
7. 7.🏋️ Pushing a crate 6 m took 480 J of work. What force was used, in newtons?
8. 8.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Ravi (170 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.True or false: chalk on a gym bar gives more friction. (a) True (b) False
10. 10.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a bent lever (d) a ramp wrapped round
11. 11.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
12. 12.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
13. 13.⚖️ A seesaw balances. Meena (140 N) sits ? m from the pivot on one side; Asha (420 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
14. 14.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 80 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
15. 15.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
16. 16.💪 Two children push a box to the right, one with 60 N and the other with 50 N. What is the net (total) force on the box, in newtons?
17. 17.True or false: sand on a slippery path gives more friction. (a) False (b) True
18. 18.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
19. 19.💪 A bag has a mass of 30 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
20. 20.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 300 N box up it, in newtons? (ideal ramp, no friction)
22. 22.🏋️ A 13 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
24. 24.💪 Which force is at work: a magnet picks up pins? (a) muscular force (b) friction (c) magnetic force (d) gravity
25. 25.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Zoya (480 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.💪 A cart is pulled to the right with 85 N and to the left with 90 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
27. 27.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) farther from the pivot (d) on the pivot
28. 28.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
29. 29.⚖️ A lever bar balances. The load is 200 N at 10 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?
30. 30.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 9 m, how many metres of rope must you pull?
31. 31.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the effort (d) the load
32. 32.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
33. 33.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
34. 34.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
35. 35.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
36. 36.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
37. 37.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
38. 38.True or false: a wheelchair ramp is an inclined plane. (a) True (b) False
39. 39.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
40. 40.⚙️ Which simple machine is a round doorknob? (a) inclined plane (b) lever (c) wheel and axle (d) screw

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