Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 814 · 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 cart is pulled to the right with 25 N and to the left with 20 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
2. 2.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
3. 3.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a wet tiled floor (d) a smooth steel slide
4. 4.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Meena (280 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.🪝 A bucket weighing 210 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
7. 7.🏋️ A 20 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
8. 8.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Meena (280 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.🏋️ Pushing a crate 10 m took 800 J of work. What force was used, in newtons?
10. 10.🏋️ Pushing a crate 3 m took 930 J of work. What force was used, in newtons?
11. 11.⚖️ A seesaw balances. Kabir (560 N) sits ? m from the pivot on one side; Asha (140 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
12. 12.True or false: chalk on a gym bar gives less friction. (a) False (b) True
13. 13.🏋️ Pushing a crate 1 m took 160 J of work. What force was used, in newtons?
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, sandpaper 13 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
18. 18.Which of these is a wedge? (a) a door stopper (b) a wheelchair ramp (c) a jar lid (d) a window blind cord
19. 19.🏋️ A 1 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
20. 20.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 40 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.🏋️ A force of 120 N pushes a cart 9 m along the floor. How much work is done, in joules?
22. 22.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1
23. 23.True or false: a grippy rubber sole gives less friction. (a) True (b) False
24. 24.⚙️ Which simple machine is a crowbar? (a) screw (b) inclined plane (c) wheel and axle (d) lever
25. 25.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
26. 26.🏋️ Pushing a crate 5 m took 800 J of work. What force was used, in newtons?
27. 27.True or false: skating on ice gives more friction. (a) True (b) False
28. 28.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) on the rock (c) on the fulcrum (d) near the fulcrum
29. 29.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
30. 30.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
31. 31.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
32. 32.⚖️ A seesaw balances. Zoya (300 N) sits 3 m from the pivot on one side; Meena (450 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.⚙️ Which simple machine is a wheelchair ramp? (a) wheel and axle (b) pulley (c) wedge (d) inclined plane
34. 34.Which of these is a wheel and axle? (a) a seesaw (b) a well-bucket rope wheel (c) a screw jack (d) a round doorknob
35. 35.⚖️ A seesaw balances. Asha (140 N) sits 1 m from the pivot on one side; Meena (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
36. 36.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 2 (c) class 1
37. 37.🏋️ 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?
38. 38.True or false: a bottle opener is a class 2 lever (load in the middle). (a) True (b) False
39. 39.Which of these is a screw? (a) a jar lid (b) a well winch handle (c) a well-bucket rope wheel (d) the tip of a nail
40. 40.True or false: a fixed pulley halves the effort. (a) True (b) False

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