Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 600 · 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 seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 70 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
3. 3.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
4. 4.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) colour of bar (d) mass of fulcrum
5. 5.True or false: pulling a cart is a push. (a) True (b) False
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
7. 7.🪝 A bucket weighing 20 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
8. 8.True or false: a grippy rubber sole gives more friction. (a) False (b) True
9. 9.True or false: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
10. 10.💪 A box weighs 130 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
11. 11.💪 A cart is pulled to the right with 100 N and to the left with 90 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
12. 12.🏋️ A force of 340 N did 1360 J of work. How many metres did the object move?
13. 13.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
14. 14.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 1 (c) class 2
15. 15.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 100 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a grippy rubber sole (d) a smooth steel slide
17. 17.💪 A box weighs 370 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
18. 18.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) True (b) False
19. 19.True or false: powder on a carrom board gives more friction. (a) False (b) True
20. 20.True or false: a water tap handle is a wheel and axle. (a) False (b) True
21. 21.🏋️ A force of 20 N did 140 J of work. How many metres did the object move?
22. 22.🏋️ A 1 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
23. 23.⚖️ A seesaw balances. Arjun (390 N) sits ? m from the pivot on one side; Ravi (130 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
24. 24.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
25. 25.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
26. 26.True or false: pushing a trolley is a pull. (a) False (b) True
27. 27.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a smaller rod (axle) (d) a flat ramp
28. 28.💪 In a tug of war, one team pulls right with 40 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
29. 29.🏋️ A force of 110 N did 110 J of work. How many metres did the object move?
30. 30.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
31. 31.True or false: pushing a trolley is a push. (a) False (b) True
32. 32.💪 In which unit do we measure force? (a) second (s) (b) metre (m) (c) litre (L) (d) newton (N)
33. 33.True or false: hitting a cricket ball is a pull. (a) True (b) False
34. 34.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
35. 35.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) turning effects match (d) the bar is short
36. 36.⚖️ A lever bar balances. The load is 70 N at ? cm from the fulcrum. The effort is 20 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
39. 39.True or false: a movable pulley halves the effort. (a) True (b) False
40. 40.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)

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