Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 76 · 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.True or false: pulling up your socks is a pull. (a) False (b) True
2. 2.🏋️ A machine lifts a load of 320 N when you push with 160 N. What is its mechanical advantage (MA)?
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
4. 4.True or false: a rough doormat gives more friction. (a) True (b) False
5. 5.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the axle (c) the effort (d) the load
6. 6.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
7. 7.Which of these is a screw? (a) a chisel (b) a well-bucket rope wheel (c) a window blind cord (d) a nut and bolt
8. 8.🏋️ Pushing a crate 2 m took 740 J of work. What force was used, in newtons?
9. 9.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
10. 10.⚖️ A lever bar balances. The load is 490 N at ? cm from the fulcrum. The effort is 350 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.Which of these is a screw? (a) a knife edge (b) a round doorknob (c) an axe blade (d) a jar lid
12. 12.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the fulcrum (c) the effort (d) the load
13. 13.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a flagpole rope wheel (c) a crowbar (d) a bottle opener
14. 14.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 2200 N box up it, in newtons? (ideal ramp, no friction)
15. 15.⚖️ A lever bar balances. The load is 300 N at 50 cm from the fulcrum. The effort is 300 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
16. 16.💪 Is pulling a cart a push or a pull? (a) a push (b) a pull
17. 17.🏋️ Pushing a crate 8 m took 2880 J of work. What force was used, in newtons?
18. 18.🔍 Which is the odd one out? (a) a window blind cord (b) a well-bucket rope wheel (c) a chisel (d) a crane hook block
19. 19.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
20. 20.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a tiny pulley (d) a bent lever
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
23. 23.🔍 Which is the odd one out? (a) a bottle cap (b) a nut and bolt (c) an axe blade (d) a jar lid
24. 24.🏋️ Can a simple machine reduce the work done? (a) no, work stays the same (b) yes, always (c) yes, by half (d) only on Mondays
25. 25.⚖️ A seesaw balances. Meena (150 N) sits 1 m from the pivot on one side; Ravi (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
26. 26.⚖️ Which class of lever is a wheelbarrow? (a) class 3 (b) class 1 (c) class 2
27. 27.🏋️ Pushing a crate 5 m took 950 J of work. What force was used, in newtons?
28. 28.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?
29. 29.🪝 A bucket weighing 440 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
30. 30.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
31. 31.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 60 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
32. 32.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
33. 33.True or false: drawing up a well bucket is a pull. (a) False (b) True
34. 34.Which of these is a screw? (a) the tip of a nail (b) a crowbar (c) a crane hook block (d) a wood screw
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
36. 36.⚖️ A lever bar balances. The load is 560 N at 20 cm from the fulcrum. The effort is 140 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
37. 37.⚖️ A lever bar balances. The load is 900 N at ? cm from the fulcrum. The effort is 100 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.💪 Which force pulls everything towards the Earth? (a) magnetism (b) gravity (c) wind (d) friction
39. 39.🪝 A pulley system lifts a 210 N load with an effort of 70 N. What is its mechanical advantage (MA)?
40. 40.🏋️ Work is done when a force moves something … (a) only upwards (b) through a distance (c) very slowly (d) without moving it

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