Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 319 · 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.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 50 cm and the load at 10 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
2. 2.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
3. 3.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 3 (d) 10
4. 4.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) True (b) False
5. 5.⚙️ Which simple machine is a screw jack? (a) inclined plane (b) wedge (c) lever (d) screw
6. 6.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
7. 7.🏋️ Pushing a crate 5 m took 1150 J of work. What force was used, in newtons?
8. 8.🏋️ A force of 90 N pushes a cart 3 m along the floor. How much work is done, in joules?
9. 9.True or false: a rough doormat gives less friction. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
11. 11.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 2 (c) class 1
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 60 cm and the load at 90 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) skating on ice (d) a wet tiled floor
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 100 cm, the fulcrum at 60 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
15. 15.True or false: a round doorknob is a wedge. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
17. 17.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a box pushed on carpet (d) sand on a slippery path
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
19. 19.Which of these is a screw? (a) a round doorknob (b) a screw jack (c) a crowbar (d) a chisel
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 11 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
21. 21.⚖️ A lever bar balances. The load is 630 N at ? cm from the fulcrum. The effort is 450 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
22. 22.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) sand on a slippery path (d) a box pushed on carpet
24. 24.🔍 Which is the odd one out? (a) a water tap handle (b) a bottle cap (c) a jar lid (d) a wood screw
25. 25.🏋️ A longer ramp to the same height needs … (a) the same effort (b) less effort (c) no effort (d) more effort
26. 26.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
27. 27.⚙️ Which simple machine is a water tap handle? (a) pulley (b) wheel and axle (c) inclined plane (d) screw
28. 28.🔍 Which is the odd one out? (a) a well-bucket rope wheel (b) a window blind cord (c) a truck loading ramp (d) a flagpole rope wheel
29. 29.💪 Which force is at work: shoes grip the floor? (a) muscular force (b) friction (c) gravity (d) magnetic force
30. 30.Which of these is a wheel and axle? (a) a nut and bolt (b) a wheelchair ramp (c) a round doorknob (d) a nutcracker
31. 31.💪 A box weighs 590 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
32. 32.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) make new energy (c) stop all friction (d) switch off gravity
33. 33.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
34. 34.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
35. 35.🏋️ Work is done when a force moves something … (a) only upwards (b) without moving it (c) through a distance (d) very slowly
36. 36.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
37. 37.⚖️ A seesaw balances. Asha (540 N) sits ? m from the pivot on one side; Arjun (720 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
38. 38.⚖️ A lever bar balances. The load is 80 N at 30 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.💪 Which force is at work: a rolling ball slows? (a) gravity (b) muscular force (c) friction (d) magnetic force
40. 40.🪝 A pulley system lifts a 520 N load with an effort of 130 N. What is its mechanical advantage (MA)?

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