Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 612 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 40 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
2. 2.⚖️ A lever bar balances. The load is 450 N at 40 cm from the fulcrum. The effort is 360 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
4. 4.⚖️ A lever bar balances. The load is 700 N at 10 cm from the fulcrum. The effort is 70 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
5. 5.🏋️ A force of 70 N pushes a cart 3 m along the floor. How much work is done, in joules?
6. 6.💪 In a tug of war, one team pulls left with 25 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
7. 7.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) yes, by half (d) no, work stays the same
8. 8.⚖️ A lever bar balances. The load is 60 N at 40 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
10. 10.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
11. 11.True or false: pressing a doorbell is a push. (a) True (b) False
12. 12.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
13. 13.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
14. 14.🏋️ A force of 280 N pushes a cart 1 m along the floor. How much work is done, in joules?
15. 15.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 560 N bucket on the axle, in newtons? (ideal)
16. 16.⚙️ A screw is really … (a) a tiny pulley (b) a bent lever (c) a ramp wrapped round (d) a kind of wheel
17. 17.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
18. 18.🔍 Which is the odd one out? (a) a round doorknob (b) a steering wheel (c) a knife edge (d) a water tap handle
19. 19.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the pulley (c) the fulcrum (d) the effort
20. 20.⚙️ Which simple machine is a claw hammer on a nail? (a) wheel and axle (b) inclined plane (c) lever (d) wedge
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
23. 23.🪝 A pulley system lifts a 320 N load with an effort of 80 N. What is its mechanical advantage (MA)?
24. 24.💪 Two children push a box to the right, one with 15 N and the other with 65 N. What is the net (total) force on the box, in newtons?
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 60 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
26. 26.⚖️ A seesaw balances. Ravi (190 N) sits 1 m from the pivot on one side; Arjun (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
28. 28.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
29. 29.🏋️ Pushing a crate 4 m took 320 J of work. What force was used, in newtons?
30. 30.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Arjun (260 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🪝 A wheel and axle is a big wheel fixed to … (a) a smaller rod (axle) (b) a flat ramp (c) a loose rope (d) a sharp wedge
32. 32.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
33. 33.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) gravity (d) magnetism
34. 34.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.💪 Two children push a box to the right, one with 40 N and the other with 40 N. What is the net (total) force on the box, in newtons?
36. 36.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) True (b) False
37. 37.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) near the fulcrum (c) on the rock (d) far from the fulcrum
38. 38.Which of these is caused by friction? (a) a thrown ball comes down (b) a compass needle turns (c) squeezing a lemon (d) brakes stop a bicycle
39. 39.True or false: closing a drawer is a pull. (a) False (b) True
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem

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