Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 878 · 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.🏋️ A 10 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 60 cm and the load at 100 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
3. 3.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) no, work stays the same (c) yes, by half (d) yes, always
4. 4.⚖️ Which class of lever is a bottle opener? (a) class 3 (b) class 2 (c) class 1
5. 5.🪝 A load of 660 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
6. 6.⚖️ A lever bar balances. The load is 150 N at 20 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?
7. 7.🪝 A load of 800 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
8. 8.💪 A bag has a mass of 28 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
9. 9.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a wheel on ball bearings
10. 10.True or false: a fixed pulley rises with the load. (a) False (b) True
11. 11.Which of these is a lever? (a) a playground slide (b) a crowbar (c) a jar lid (d) a window blind cord
12. 12.🏋️ A force of 220 N did 1760 J of work. How many metres did the object move?
13. 13.Which of these is a screw? (a) a truck loading ramp (b) a seesaw (c) a window blind cord (d) a jar lid
14. 14.True or false: a flagpole rope wheel is a lever. (a) False (b) True
15. 15.⚖️ A seesaw balances. Zoya (? N) sits 4 m from the pivot on one side; Kabir (480 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
16. 16.🏋️ A force of 380 N did 760 J of work. How many metres did the object move?
17. 17.Which of these is caused by magnetic force? (a) squeezing a lemon (b) rubbing hands warms them (c) a magnet picks up pins (d) rain falls to the ground
18. 18.🏋️ A force of 230 N did 1380 J of work. How many metres did the object move?
19. 19.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 3 m, how many metres of rope must you pull?
20. 20.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) the tip of a nail (c) a crowbar (d) a bottle opener
21. 21.⚖️ A seesaw balances. Ravi (240 N) sits 2 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.⚖️ A lever bar balances. The load is 480 N at ? cm from the fulcrum. The effort is 160 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
23. 23.🏋️ A machine lifts a load of 400 N when you push with 100 N. What is its mechanical advantage (MA)?
24. 24.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) no change (d) less effort needed
25. 25.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the effort (c) the load (d) the fulcrum
26. 26.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Ravi (520 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
28. 28.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
30. 30.True or false: a fixed pulley stays in one place. (a) False (b) True
31. 31.🏋️ Pushing a crate 3 m took 1080 J of work. What force was used, in newtons?
32. 32.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a tyre with deep treads
34. 34.🏋️ In which unit is work measured? (a) joule (J) (b) metre (m) (c) watt hour (d) newton (N)
35. 35.True or false: a smooth steel slide gives more friction. (a) True (b) False
36. 36.True or false: a claw hammer on a nail is a lever. (a) True (b) False
37. 37.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 4 m, how many metres of rope must you pull?
38. 38.Which of these is caused by muscular force? (a) squeezing a lemon (b) rain falls to the ground (c) shoes grip the floor (d) a fridge magnet sticks
39. 39.⚙️ Which simple machine is the tip of a nail? (a) inclined plane (b) lever (c) screw (d) wedge
40. 40.🏋️ A force of 220 N pushes a cart 9 m along the floor. How much work is done, in joules?

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