Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 161 · 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.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
2. 2.⚖️ A lever bar balances. The load is 40 N at 10 cm from the fulcrum. The effort is 20 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.🪝 A bucket weighing 470 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
4. 4.True or false: a movable pulley is on a flagpole top. (a) True (b) False
5. 5.Which of these is caused by muscular force? (a) an apple falls down (b) shoes grip the floor (c) lifting a school bag (d) a fridge magnet sticks
6. 6.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) False (b) True
7. 7.Which of these is caused by gravity? (a) rubbing hands warms them (b) a magnet picks up pins (c) a river flows downhill (d) brakes stop a bicycle
8. 8.Which of these is caused by friction? (a) a thrown ball comes down (b) shoes grip the floor (c) pedalling a cycle (d) rain falls to the ground
9. 9.⚖️ A seesaw balances. Asha (220 N) sits 3 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) anywhere (d) farther from the pivot
11. 11.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 15 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
14. 14.True or false: a flagpole rope wheel is a pulley. (a) True (b) False
15. 15.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Asha (170 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
18. 18.🏋️ 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?
19. 19.Which of these is a pulley? (a) the tip of a nail (b) a jar lid (c) a steering wheel (d) a crane hook block
20. 20.⚖️ A seesaw balances. Asha (300 N) sits 4 m from the pivot on one side; Meena (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
21. 21.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
22. 22.⚖️ A seesaw balances. Asha (340 N) sits 2 m from the pivot on one side; Arjun (340 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
23. 23.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) very slowly (d) through a distance
24. 24.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) far from the fulcrum (c) near the fulcrum (d) on the fulcrum
25. 25.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 80 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
26. 26.True or false: pressing a doorbell is a push. (a) True (b) False
27. 27.True or false: a fixed pulley stays in one place. (a) False (b) True
28. 28.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
29. 29.⚖️ A seesaw balances. Zoya (160 N) sits 2 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?
30. 30.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
31. 31.True or false: drawing up a well bucket is a push. (a) False (b) True
32. 32.Which of these is an inclined plane? (a) a screw jack (b) a steering wheel (c) a claw hammer on a nail (d) a wheelchair ramp
33. 33.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
34. 34.🪝 A pulley system lifts a 40 N load with an effort of 20 N. What is its mechanical advantage (MA)?
35. 35.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) colour of bar (d) time taken
36. 36.🏋️ A force of 40 N pushes a cart 8 m along the floor. How much work is done, in joules?
37. 37.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Kabir (280 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a tyre with deep treads
39. 39.🏋️ Pushing a crate 8 m took 3920 J of work. What force was used, in newtons?
40. 40.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) more effort needed (d) the load floats

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