Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 218 · 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.🏋️ Pushing a crate 9 m took 4140 J of work. What force was used, in newtons?
2. 2.Which of these is a lever? (a) a well-bucket rope wheel (b) a claw hammer on a nail (c) a bottle cap (d) a crane hook block
3. 3.True or false: a fixed pulley stays in one place. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) chalk on a gym bar (d) a smooth steel slide
5. 5.True or false: skating on ice gives more friction. (a) False (b) True
6. 6.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 1 (c) class 2
7. 7.True or false: a playground slide is a wedge. (a) True (b) False
8. 8.⚖️ Turning effect = force × … (a) colour of bar (b) mass of fulcrum (c) distance from fulcrum (d) time taken
9. 9.⚖️ A lever bar balances. The load is 60 N at 40 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.⚙️ Which simple machine is a truck loading ramp? (a) pulley (b) wheel and axle (c) inclined plane (d) wedge
11. 11.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
12. 12.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
13. 13.💪 Which force pulls everything towards the Earth? (a) magnetism (b) gravity (c) wind (d) friction
14. 14.True or false: a beam balance is a class 1 lever (fulcrum in the middle). (a) True (b) False
15. 15.💪 In a tug of war, one team pulls left with 40 N and the other pulls right with 30 N. What is the size of the net force, in newtons?
16. 16.True or false: the tip of a nail is a lever. (a) True (b) False
17. 17.🪝 A pulley system lifts a 300 N load with an effort of 150 N. What is its mechanical advantage (MA)?
18. 18.Which of these is a lever? (a) a steering wheel (b) a chisel (c) the tip of a nail (d) a crowbar
19. 19.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
20. 20.⚖️ Which class of lever is a bottle opener? (a) class 2 (b) class 1 (c) class 3
21. 21.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
22. 22.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
23. 23.💪 Which force is at work: pedalling a cycle? (a) magnetic force (b) friction (c) muscular force (d) gravity
24. 24.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
25. 25.🔍 Which is the odd one out? (a) a knife edge (b) a claw hammer on a nail (c) a chisel (d) the tip of a nail
26. 26.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
27. 27.💪 In which unit do we measure force? (a) litre (L) (b) second (s) (c) newton (N) (d) metre (m)
28. 28.⚖️ A seesaw balances. Arjun (130 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?
29. 29.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
30. 30.💪 Which force is at work: a river flows downhill? (a) friction (b) gravity (c) muscular force (d) magnetic force
31. 31.⚖️ What is the pivot point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
32. 32.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
33. 33.⚖️ A lever bar balances. The load is 600 N at 20 cm from the fulcrum. The effort is 120 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 15 N, ice 4 N, a glass sheet 8 N, a wooden plank 12 N. How many newtons more were needed on a carpet than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 11 N, a carpet 14 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
36. 36.🏋️ A force of 450 N did 900 J of work. How many metres did the object move?
37. 37.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 40 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
39. 39.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem

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