Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 768 · 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. Ravi (110 N) sits 4 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.⚖️ A lever balances when … (a) both weights are equal (b) turning effects match (c) the fulcrum moves (d) the bar is short
3. 3.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
4. 4.🏋️ A 4 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
5. 5.🔍 Which is the odd one out? (a) a jar lid (b) a wood screw (c) a crane hook block (d) a screw jack
6. 6.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
7. 7.🪝 A load of 510 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.Which of these is caused by muscular force? (a) brakes stop a bicycle (b) a fridge magnet sticks (c) lifting a school bag (d) shoes grip the floor
9. 9.⚖️ A lever bar balances. The load is 720 N at 10 cm from the fulcrum. The effort is 90 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.⚖️ A lever bar balances. The load is 490 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?
11. 11.⚖️ A lever bar balances. The load is 270 N at 10 cm from the fulcrum. The effort is 30 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.Which of these is caused by muscular force? (a) a thrown ball comes down (b) a river flows downhill (c) shoes grip the floor (d) pedalling a cycle
13. 13.⚖️ A lever bar balances. The load is 320 N at ? cm from the fulcrum. The effort is 320 N at 40 cm from the fulcrum on the other side. What is the missing distance in centimetres?
14. 14.🪝 More rope sections holding a load means … (a) no change (b) the load floats (c) more effort needed (d) less effort needed
15. 15.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
16. 16.🔍 Which is the odd one out? (a) a nut and bolt (b) the tip of a nail (c) a jar lid (d) a screw jack
17. 17.True or false: a wet tiled floor gives more friction. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
19. 19.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
20. 20.⚖️ Which class of lever is a broom when sweeping? (a) class 3 (b) class 2 (c) class 1
21. 21.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
22. 22.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
23. 23.Which of these is a wedge? (a) a nutcracker (b) a well-bucket rope wheel (c) a seesaw (d) a chisel
24. 24.⚖️ A seesaw balances. Arjun (120 N) sits ? m from the pivot on one side; Zoya (480 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
25. 25.True or false: a crowbar is a lever. (a) False (b) True
26. 26.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 6 (c) 3 (d) 12
27. 27.💪 Two children push a box to the right, one with 95 N and the other with 15 N. What is the net (total) force on the box, in newtons?
28. 28.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
29. 29.🏋️ A 12 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.🏋️ Pushing a crate 2 m took 100 J of work. What force was used, in newtons?
31. 31.🏋️ Pushing a crate 9 m took 3780 J of work. What force was used, in newtons?
32. 32.🪝 A pulley system lifts a 200 N load with an effort of 100 N. What is its mechanical advantage (MA)?
33. 33.💪 Which force is at work: an apple falls down? (a) muscular force (b) friction (c) magnetic force (d) gravity
34. 34.🏋️ Pushing a crate 6 m took 300 J of work. What force was used, in newtons?
35. 35.True or false: plucking a mango is a pull. (a) False (b) True
36. 36.True or false: skating on ice gives more friction. (a) True (b) False
37. 37.🏋️ A force of 140 N did 1400 J of work. How many metres did the object move?
38. 38.True or false: a nutcracker is a class 2 lever (load in the middle). (a) True (b) False
39. 39.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
40. 40.💪 A cart is pulled to the right with 85 N and to the left with 95 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force

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