Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 780 · 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 bottle opener is a class 2 lever (load in the middle). (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) a window blind cord (b) a well-bucket rope wheel (c) a flagpole rope wheel (d) a wheelchair ramp
3. 3.🪝 What does a single fixed pulley change? (a) gravity (b) the size of the load (c) the colour of rope (d) the direction of pull
4. 4.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
5. 5.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
6. 6.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
7. 7.💪 Two equal forces push on a box from opposite sides. They are … (a) unbalanced (b) balanced (c) gravity (d) doubled
8. 8.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 3 (c) class 2
9. 9.⚙️ Which simple machine is a well winch handle? (a) screw (b) wheel and axle (c) pulley (d) wedge
10. 10.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
11. 11.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
12. 12.True or false: a smooth steel slide gives less friction. (a) False (b) True
13. 13.💪 Which can a force NOT do? (a) change its colour (b) change its shape (c) stop it moving (d) start it moving
14. 14.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) on the pivot (c) farther from the pivot (d) anywhere
15. 15.True or false: a pair of pliers is a class 3 lever (effort in the middle). (a) True (b) False
16. 16.🪝 A load of 200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
17. 17.⚖️ A seesaw balances. Ravi (760 N) sits 2 m from the pivot on one side; Asha (380 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
18. 18.True or false: pulling a cart is a push. (a) False (b) True
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
20. 20.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a smaller rod (axle) (c) a sharp wedge (d) a flat ramp
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the fulcrum (d) the effort
23. 23.💪 A bag has a mass of 21 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
24. 24.⚙️ A screw is really … (a) a ramp wrapped round (b) a bent lever (c) a tiny pulley (d) a kind of wheel
25. 25.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) powder on a carrom board (d) a rough doormat
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
27. 27.🏋️ An 11 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.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
29. 29.💪 Which force is at work: a rolling ball slows? (a) gravity (b) muscular force (c) friction (d) magnetic force
30. 30.🪝 A load of 630 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
31. 31.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the pulley (d) the load
32. 32.True or false: a claw hammer on a nail is a lever. (a) False (b) True
33. 33.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
34. 34.True or false: a pair of kitchen tongs is a class 1 lever (fulcrum in the middle). (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a nutcracker (b) a screw jack (c) a crowbar (d) a bottle opener
36. 36.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
37. 37.True or false: a movable pulley halves the effort. (a) False (b) True
38. 38.🏋️ A 17 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
39. 39.True or false: a grippy rubber sole gives more friction. (a) True (b) False
40. 40.🏋️ A force of 350 N pushes a cart 3 m along the floor. How much work is done, in joules?

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