Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 783 · 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: a nutcracker is a class 2 lever (load in the middle). (a) False (b) True
2. 2.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
3. 3.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 280 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a tiny pulley (d) a kind of wheel
7. 7.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
8. 8.🪝 A load of 960 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
9. 9.True or false: a door stopper is a wedge. (a) False (b) True
10. 10.🏋️ Pushing a crate 5 m took 250 J of work. What force was used, in newtons?
11. 11.🏋️ A machine lifts a load of 390 N when you push with 130 N. What is its mechanical advantage (MA)?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
13. 13.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) sand on a slippery path (d) a wheel on ball bearings
15. 15.Which of these is a wheel and axle? (a) a knife edge (b) a steering wheel (c) a bottle opener (d) a crowbar
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.🪝 What does a single fixed pulley change? (a) the size of the load (b) the colour of rope (c) gravity (d) the direction of pull
18. 18.🪝 A load of 360 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
19. 19.⚖️ A seesaw balances. Arjun (170 N) sits 4 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚖️ A seesaw balances. Ravi (420 N) sits 2 m from the pivot on one side; Kabir (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.🪝 A pulley system lifts a 500 N load with an effort of 250 N. What is its mechanical advantage (MA)?
22. 22.⚖️ A lever balances when … (a) turning effects match (b) the bar is short (c) both weights are equal (d) the fulcrum moves
23. 23.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 40 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
25. 25.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
26. 26.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
27. 27.True or false: chalk on a gym bar gives more friction. (a) False (b) True
28. 28.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
29. 29.⚖️ A lever bar balances. The load is 300 N at 40 cm from the fulcrum. The effort is 400 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the effort (c) the fulcrum (d) the load
31. 31.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 60 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
32. 32.True or false: a box pushed on carpet gives less friction. (a) True (b) False
33. 33.True or false: a road up a hill is a pulley. (a) False (b) True
34. 34.💪 In a tug of war, one team pulls right with 85 N and the other pulls left with 15 N. What is the size of the net force, in newtons?
35. 35.⚖️ What is the pivot point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
36. 36.Which of these is a wheel and axle? (a) a chisel (b) a jar lid (c) a bottle opener (d) a round doorknob
37. 37.🪝 A pulley system lifts a 920 N load with an effort of 230 N. What is its mechanical advantage (MA)?
38. 38.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
39. 39.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a grippy rubber sole (d) a rough doormat
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2

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