Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 901 · 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 round doorknob is an inclined plane. (a) False (b) True
2. 2.🏋️ A smooth ramp is 18 m long and rises 3 m. What effort pushes a 6000 N box up it, in newtons? (ideal ramp, no friction)
3. 3.💪 A box weighs 280 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
4. 4.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) muscular force (c) friction (d) gravity
5. 5.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 30 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.True or false: a rough doormat gives less friction. (a) True (b) False
7. 7.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 120 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
8. 8.💪 Which force is at work: a rolling ball slows? (a) muscular force (b) friction (c) magnetic force (d) gravity
9. 9.💪 A bag has a mass of 44 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
10. 10.🏋️ A machine lifts a load of 600 N when you push with 100 N. What is its mechanical advantage (MA)?
11. 11.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
12. 12.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
13. 13.🛞 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 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
14. 14.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Asha (240 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
15. 15.True or false: a well winch handle is a wheel and axle. (a) True (b) False
16. 16.💪 In which unit do we measure force? (a) second (s) (b) litre (L) (c) newton (N) (d) metre (m)
17. 17.🏋️ Pushing a crate 4 m took 400 J of work. What force was used, in newtons?
18. 18.⚖️ A seesaw balances. Kabir (280 N) sits 1 m from the pivot on one side; Arjun (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
19. 19.True or false: powder on a carrom board gives more friction. (a) True (b) False
20. 20.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
21. 21.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (440 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.True or false: a fishing rod is a class 3 lever (effort in the middle). (a) True (b) False
23. 23.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the fulcrum (d) the load
24. 24.True or false: a knife edge is a wedge. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) a jar lid (b) a wood screw (c) a screw jack (d) a knife edge
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🔍 Which is the odd one out? (a) a truck loading ramp (b) a wheelchair ramp (c) a playground slide (d) the tip of a nail
28. 28.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 1 (c) class 3
29. 29.🔍 Which is the odd one out? (a) a round doorknob (b) a well winch handle (c) a crowbar (d) a steering wheel
30. 30.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
31. 31.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
32. 32.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 450 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 40 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
34. 34.🏋️ A force of 20 N pushes a cart 2 m along the floor. How much work is done, in joules?
35. 35.⚖️ A seesaw balances. Kabir (220 N) sits ? m from the pivot on one side; Meena (330 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
36. 36.🏋️ A force of 130 N pushes a cart 6 m along the floor. How much work is done, in joules?
37. 37.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
38. 38.⚙️ Which simple machine is a bottle cap? (a) screw (b) wheel and axle (c) lever (d) pulley
39. 39.⚖️ A seesaw balances. Asha (240 N) sits 2 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3

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