Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 15 · 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 fixed pulley makes you pull 2× rope. (a) False (b) True
2. 2.🏋️ A force of 200 N did 1400 J of work. How many metres did the object move?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
4. 4.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 12 (d) 6
5. 5.True or false: your forearm is a class 2 lever (load in the middle). (a) True (b) False
6. 6.⚙️ A screw is really … (a) a ramp wrapped round (b) a tiny pulley (c) a bent lever (d) a kind of wheel
7. 7.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 1 (c) class 2
8. 8.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 2 (c) class 1
9. 9.🪝 A load of 960 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
10. 10.🏋️ A machine lifts a load of 450 N when you push with 150 N. What is its mechanical advantage (MA)?
11. 11.Which of these is caused by gravity? (a) a fridge magnet sticks (b) brakes stop a bicycle (c) a rolling ball slows (d) rain falls to the ground
12. 12.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
13. 13.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
14. 14.⚖️ Which class of lever is a nutcracker? (a) class 2 (b) class 3 (c) class 1
15. 15.💪 A box weighs 600 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
16. 16.⚖️ A lever bar balances. The load is 280 N at 30 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?
17. 17.🏋️ A force of 200 N did 800 J of work. How many metres did the object move?
18. 18.⚖️ Which class of lever is a fishing rod? (a) class 2 (b) class 1 (c) class 3
19. 19.⚙️ Which simple machine is a water tap handle? (a) inclined plane (b) wheel and axle (c) pulley (d) screw
20. 20.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
21. 21.🪝 A load of 630 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
22. 22.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
23. 23.🏋️ A force of 240 N pushes a cart 2 m along the floor. How much work is done, in joules?
24. 24.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
25. 25.🪝 A load of 390 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
26. 26.🏋️ Pushing a crate 7 m took 2730 J of work. What force was used, in newtons?
27. 27.🏋️ A machine lifts a load of 120 N when you push with 20 N. What is its mechanical advantage (MA)?
28. 28.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Ravi (360 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.True or false: a crowbar is a lever. (a) True (b) False
30. 30.💪 A box weighs 90 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
31. 31.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
32. 32.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) joule (J) (d) metre (m)
33. 33.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Asha (120 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.⚙️ Which simple machine is a window blind cord? (a) lever (b) inclined plane (c) screw (d) pulley
35. 35.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a smooth steel slide (d) a wet tiled floor
36. 36.True or false: a pair of kitchen tongs is a class 3 lever (effort in the middle). (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a tyre with deep treads (d) a grippy rubber sole
38. 38.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
39. 39.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 80 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
40. 40.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem

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