Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 139 · 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: your forearm is a class 2 lever (load in the middle). (a) True (b) False
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) closer to the pivot (d) anywhere
4. 4.🏋️ A force of 500 N did 1500 J of work. How many metres did the object move?
5. 5.⚖️ A seesaw balances. Kabir (300 N) sits ? m from the pivot on one side; Asha (150 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
6. 6.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
7. 7.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) yes, by half (c) only on Mondays (d) no, work stays the same
8. 8.True or false: powder on a carrom board gives less friction. (a) False (b) True
9. 9.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 2 (b) class 3 (c) class 1
10. 10.💪 Two equal forces push on a box from opposite sides. They are … (a) doubled (b) gravity (c) unbalanced (d) balanced
11. 11.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
12. 12.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
13. 13.🔍 Which is the odd one out? (a) a bottle opener (b) a well winch handle (c) a crowbar (d) a nutcracker
14. 14.Which of these is a lever? (a) a well winch handle (b) a wheelchair ramp (c) a round doorknob (d) a bottle opener
15. 15.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a tiny pulley (d) a kind of wheel
16. 16.🏋️ A force of 260 N pushes a cart 1 m along the floor. How much work is done, in joules?
17. 17.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
19. 19.🏋️ A force of 260 N did 260 J of work. How many metres did the object move?
20. 20.🏋️ A longer ramp to the same height needs … (a) more effort (b) the same effort (c) less effort (d) no effort
21. 21.💪 A bag has a mass of 53 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
22. 22.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) gravity (d) the colour of rope
23. 23.⚖️ Which class of lever is a pair of pliers? (a) class 2 (b) class 1 (c) class 3
24. 24.🪝 A load of 400 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
25. 25.🏋️ A 15 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
26. 26.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
27. 27.Which of these is a pulley? (a) a door stopper (b) a crane hook block (c) a chisel (d) a seesaw
28. 28.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) turning effects match (d) both weights are equal
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
30. 30.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
31. 31.True or false: a wood screw is a screw. (a) True (b) False
32. 32.🏋️ A force of 260 N pushes a cart 2 m along the floor. How much work is done, in joules?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
34. 34.💪 In which unit do we measure force? (a) newton (N) (b) second (s) (c) litre (L) (d) metre (m)
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
36. 36.🏋️ Pushing a crate 10 m took 4600 J of work. What force was used, in newtons?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 11 N, a carpet 13 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 7 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
39. 39.💪 Which force is at work: a thrown ball comes down? (a) gravity (b) muscular force (c) magnetic force (d) friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank

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