Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 752 · 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 beam balance is a class 3 lever (effort in the middle). (a) True (b) False
2. 2.⚙️ Which simple machine is a road up a hill? (a) pulley (b) wheel and axle (c) inclined plane (d) screw
3. 3.True or false: a screw jack is a screw. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a door stopper (b) a chisel (c) a knife edge (d) a window blind cord
5. 5.Which of these is a pulley? (a) a screw jack (b) a seesaw (c) a playground slide (d) a well-bucket rope wheel
6. 6.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
7. 7.🪝 A load of 90 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) the colour of rope (d) gravity
9. 9.⚖️ Which class of lever is a pair of scissors? (a) class 1 (b) class 2 (c) class 3
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
11. 11.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a box pushed on carpet (d) a grippy rubber sole
13. 13.💪 Which force is at work: squeezing a lemon? (a) gravity (b) magnetic force (c) friction (d) muscular force
14. 14.💪 Which force pulls everything towards the Earth? (a) friction (b) magnetism (c) gravity (d) wind
15. 15.🪝 More rope sections holding a load means … (a) less effort needed (b) no change (c) the load floats (d) more effort needed
16. 16.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 12 (d) 6
17. 17.True or false: a wood screw is a screw. (a) False (b) True
18. 18.⚙️ A screw is really … (a) a kind of wheel (b) a ramp wrapped round (c) a tiny pulley (d) a bent lever
19. 19.⚖️ A seesaw balances. Meena (200 N) sits 3 m from the pivot on one side; Zoya (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Arjun (120 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.True or false: pushing a trolley is a pull. (a) True (b) False
22. 22.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
23. 23.True or false: opening a drawer is a push. (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, ice 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
25. 25.⚙️ 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
26. 26.🛞 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 wooden plank 6 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
27. 27.🏋️ A 5 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
28. 28.💪 Two children push a box to the right, one with 30 N and the other with 85 N. What is the net (total) force on the box, in newtons?
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
30. 30.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
31. 31.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 5400 N box up it, in newtons? (ideal ramp, no friction)
32. 32.💪 A bag has a mass of 13 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
34. 34.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 30 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.True or false: skating on ice gives more friction. (a) True (b) False
36. 36.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
37. 37.⚖️ A seesaw balances. Asha (440 N) sits 3 m from the pivot on one side; Meena (330 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
38. 38.⚖️ A seesaw balances. Zoya (200 N) sits 1 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 1 (c) class 2
40. 40.🏋️ A 15 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

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