Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 294 · 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 seesaw balances. Arjun (110 N) sits ? m from the pivot on one side; Zoya (440 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
2. 2.⚖️ A lever bar balances. The load is 240 N at 40 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.Which of these is an inclined plane? (a) a screw jack (b) a seesaw (c) a wheelchair ramp (d) a crowbar
4. 4.💪 In which unit do we measure force? (a) litre (L) (b) newton (N) (c) second (s) (d) metre (m)
5. 5.⚖️ A seesaw balances. Meena (330 N) sits 2 m from the pivot on one side; Ravi (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
7. 7.True or false: closing a drawer is a push. (a) False (b) True
8. 8.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
9. 9.Which of these is a lever? (a) a crowbar (b) a door stopper (c) a wood screw (d) a well winch handle
10. 10.⚖️ A seesaw balances. Arjun (320 N) sits ? m from the pivot on one side; Kabir (160 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
11. 11.⚖️ A lever bar balances. The load is 160 N at ? cm from the fulcrum. The effort is 80 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 30 cm, the fulcrum at 80 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
13. 13.💪 Which force is at work: a thrown ball comes down? (a) muscular force (b) gravity (c) friction (d) magnetic force
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
15. 15.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
16. 16.💪 Which force is at work: an apple falls down? (a) friction (b) magnetic force (c) muscular force (d) gravity
17. 17.⚖️ A seesaw balances. Kabir (300 N) sits 4 m from the pivot on one side; Zoya (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.🪝 A winch has a wheel of radius 30 cm and an axle of radius 5 cm. What effort on the wheel lifts a 1080 N bucket on the axle, in newtons? (ideal)
19. 19.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
20. 20.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load ÷ effort (d) load × effort
21. 21.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
22. 22.💪 Is a tug of war a push or a pull? (a) a pull (b) a push
23. 23.⚖️ A seesaw balances. Zoya (140 N) sits 1 m from the pivot on one side; Asha (140 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
24. 24.💪 In a tug of war, one team pulls left with 40 N and the other pulls right with 25 N. What is the size of the net force, in newtons?
25. 25.🏋️ Pushing a crate 6 m took 840 J of work. What force was used, in newtons?
26. 26.⚙️ Which simple machine is a seesaw? (a) wedge (b) screw (c) pulley (d) lever
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
28. 28.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
29. 29.💪 A cart is pulled to the right with 65 N and to the left with 70 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
31. 31.Which of these is a wedge? (a) a well-bucket rope wheel (b) a water tap handle (c) a well winch handle (d) a chisel
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 10 cm and the load at 80 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
33. 33.🔍 Which is the odd one out? (a) a road up a hill (b) a wheelchair ramp (c) a wood screw (d) a truck loading ramp
34. 34.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
35. 35.💪 Which force is at work: a compass needle turns? (a) gravity (b) muscular force (c) friction (d) magnetic force
36. 36.💪 Which force is at work: a river flows downhill? (a) friction (b) gravity (c) magnetic force (d) muscular force
37. 37.⚖️ 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
38. 38.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) use a smaller force (c) make new energy (d) stop all friction
39. 39.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the size of the load (d) the direction of pull
40. 40.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always

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