Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 619 · 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.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) use a smaller force (c) make new energy (d) switch off gravity
2. 2.True or false: pushing a trolley is a pull. (a) True (b) False
3. 3.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Meena (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🏋️ Pushing a crate 4 m took 720 J of work. What force was used, in newtons?
5. 5.💪 Two children push a box to the right, one with 20 N and the other with 25 N. What is the net (total) force on the box, in newtons?
6. 6.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a road up a hill (c) a wheelchair ramp (d) a playground slide
7. 7.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) False (b) True
8. 8.🏋️ A force of 20 N pushes a cart 3 m along the floor. How much work is done, in joules?
9. 9.True or false: a fishing rod is a class 1 lever (fulcrum in the middle). (a) True (b) False
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
11. 11.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 180 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
13. 13.Which of these is caused by gravity? (a) a river flows downhill (b) a magnet picks up pins (c) a compass needle turns (d) a rolling ball slows
14. 14.True or false: a movable pulley makes you pull 2× rope. (a) False (b) True
15. 15.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
16. 16.🪝 A load of 60 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
17. 17.⚖️ A seesaw balances. Ravi (400 N) sits 4 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 240 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
20. 20.True or false: your forearm is a class 3 lever (effort in the middle). (a) True (b) False
21. 21.⚖️ Which class of lever is a seesaw? (a) class 1 (b) class 2 (c) class 3
22. 22.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
23. 23.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 6 (d) 10
24. 24.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) very slowly (d) through a distance
25. 25.🏋️ A force of 100 N pushes a cart 4 m along the floor. How much work is done, in joules?
26. 26.🏋️ Pushing a crate 2 m took 320 J of work. What force was used, in newtons?
27. 27.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the load (c) the axle (d) the effort
28. 28.💪 In a tug of war, one team pulls left with 55 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
29. 29.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
30. 30.True or false: a claw hammer on a nail is a screw. (a) True (b) False
31. 31.🪝 A pulley system lifts an 800 N load with an effort of 200 N. What is its mechanical advantage (MA)?
32. 32.⚙️ Which simple machine is a water tap handle? (a) wedge (b) screw (c) pulley (d) wheel and axle
33. 33.True or false: a knife edge is a wedge. (a) False (b) True
34. 34.🏋️ An 8 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
35. 35.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 80 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
36. 36.💪 A cart is pulled to the right with 40 N and to the left with 35 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 6 N, a glass sheet 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
38. 38.💪 Is pulling a cart a push or a pull? (a) a pull (b) a push
39. 39.🔍 Which is the odd one out? (a) a round doorknob (b) a crowbar (c) a steering wheel (d) a well winch handle
40. 40.💪 Is a tug of war a push or a pull? (a) a pull (b) a push

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