Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 382 · 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.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)
2. 2.🏋️ A 7 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
3. 3.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
4. 4.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
5. 5.⚖️ A seesaw balances. Arjun (160 N) sits ? m from the pivot on one side; Ravi (640 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
6. 6.⚙️ Which simple machine is a knife edge? (a) wheel and axle (b) pulley (c) wedge (d) screw
7. 7.Which of these is caused by gravity? (a) a thrown ball comes down (b) a rolling ball slows (c) a magnet picks up pins (d) a compass needle turns
8. 8.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
10. 10.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 200 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
12. 12.True or false: kicking a football is a push. (a) True (b) False
13. 13.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
14. 14.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
15. 15.True or false: a window blind cord is a pulley. (a) False (b) True
16. 16.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
17. 17.⚖️ A lever bar balances. The load is 320 N at ? cm from the fulcrum. The effort is 160 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
18. 18.⚖️ A lever bar balances. The load is 80 N at 10 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
19. 19.💪 Which force is at work: a fridge magnet sticks? (a) muscular force (b) magnetic force (c) friction (d) gravity
20. 20.🏋️ A machine lifts a load of 340 N when you push with 170 N. What is its mechanical advantage (MA)?
21. 21.💪 Which force pulls everything towards the Earth? (a) wind (b) friction (c) gravity (d) magnetism
22. 22.⚖️ A seesaw balances. Kabir (360 N) sits ? m from the pivot on one side; Meena (120 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
23. 23.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
25. 25.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
26. 26.⚖️ A lever bar balances. The load is 500 N at 50 cm from the fulcrum. The effort is 250 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.⚖️ A lever bar balances. The load is 20 N at ? cm from the fulcrum. The effort is 10 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.🪝 More rope sections holding a load means … (a) no change (b) more effort needed (c) less effort needed (d) the load floats
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
30. 30.⚙️ A screw is really … (a) a bent lever (b) a tiny pulley (c) a ramp wrapped round (d) a kind of wheel
31. 31.💪 Two children push a box to the right, one with 30 N and the other with 10 N. What is the net (total) force on the box, in newtons?
32. 32.🔍 Which is the odd one out? (a) a steering wheel (b) a wheelchair ramp (c) a truck loading ramp (d) a playground slide
33. 33.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a sharp wedge (d) a smaller rod (axle)
34. 34.⚖️ 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
35. 35.⚖️ A lever bar balances. The load is 160 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?
36. 36.True or false: a pair of pliers is a class 1 lever (fulcrum in the middle). (a) False (b) True
37. 37.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
38. 38.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
39. 39.⚖️ A seesaw balances. Meena (600 N) sits 1 m from the pivot on one side; Zoya (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.⚙️ Which simple machine is a window blind cord? (a) pulley (b) wheel and axle (c) screw (d) lever

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